If the Buyer's demand or request is not possible, we should A) Kill it B) Discus it later C) Address it & solve it later, what should we do?

this always happens.
So to avoid these things, its good to clear all the terms and condition in advance and if still customer ask for more.
Address it and solve the issue.

going into negotiation you must know what you need,what is of importance to you and the other party.

in selling you want to maximize your profit,the customers need is to get the best value for the money.

you must analyze what is important for him and hold it as a winning card.

only give what is of low value to you and of great value to them.

 

analyze,study,negotiate for a win win situation inorderb to retain ypour customer, never loose a customer.

we have to clearly tell to customer that i will provide the things within sometimes

A customer is after all a human being and this is human nature for some.   Therefore, in business, even though we have to consider each and every customer to be a king, we should be able to address the current situation by explaining the reasons why we cannot fulfil it at that point. 

A salesperson, on the other hand, can use the viewpoint of the customer and forward it to the Management for further analysis

I mean, if it is a constructive and a reasonable demand, which is not available for that product, the salesman can suggest to include such matters for future sales innings.  Then upon implementation, the salesperson can contact such customers and attract their attention accordingly. 

If it is unreasonable, try diverting their attention elsewhere.

Kill it - kill the buyer's demand or request on that time itself.
Don't wait to solve our customers issue, so its should not b discuss later or solve it later.
Try to make understand the buyer's issue and solve from both side.
In sales or marketing there is no later , we have to try that second only

Completely subjective, based on client and relationship this call can be taken.
Some clients give you huge orders and their demands are meager and it can be accommodated, so why not go for it if its compensated someway BUT with clear message.
In some cases, its not really viable so you should pull off rather than wasting time and effort.

I will go for option (C) to address the issue and solve it later ...
in general there are two concepts applied an old one Sales concept that is to provide with products/services and push its sales up and a new one which is Marketing concept and that is to address and solicit customers needs so that the required product/service can be offered and market demand can be fulfilled.

i suppose he/she is still a good prospect.
his/her case should be kept while treated in a different way.
he may need additional information and more time.
the sales person and buyer can mutually determine the required amount.

(C) Address it and solve it later.
---- We really cannot please everybody and almost everyday we meet a wide array of customers to which "too demanding" customers maybe a quarter or so.
In this case we can discuss it to them the strength of our products and its advantages.
For the demands that you think is really out of the blue then you can positively rebut it by saying "but you know what your views and wants sounds interesting, you can visit our website and state your suggestions there.
well, it may not be true and possible today but perhaps in the future, an idea that you can provide our management for consideration.

Address it and solve it even by outsourcing is possible.
That keeps the customer tied to you !!!!

depends on business case- discuss with the customer to deliver it late if he accepts OR at least keep our bsuiness relationship viable