Which option one should have in selling process (Sales & Marketing )...? 1.) Convincing power 2.) Persons credibility 4.) Trust worthiness

The answer is Convincing power. In sales, nothing else matters.

I believe, in sales process most important step would be placing of offering (Product or Service), if it is convincing, all will be done easily. Credibility and Trust worthiness is later to develop during transactions. 

It depends if you want to make a one time sales or you intend to continue selling your products and services to that customer.

If you want to make a one time sale than convincing power would be very useful, however, if you want to establish a longer relationship with customers than credibility and trustworthiness are more important.

We Should know the difference between sales skills and sales process.

There is no option one in sales process, each step is valuable to close the sale.

-Prospecting and qualifying.

-Approach.

-Presentation.

-Demonstration.

-Handling objections.

-Closing.

-Follow-up.

All are necessary but first come convincing power as after convincing other factor work.

Ideally must be all of above, but main is convincing power, other by my opinion are steps for it

in real life I dealed with hundreds of sales person, and i saw some  cases totally not reable and trustworthing goods selling and not that honest sales  person was succesfull because of covincing power

just imagine, almost noone if you ask beleives advertisment, almost every buyer has feeling that product and price are not that good but majority of them stll buy a product because of convinsing power of  salesforce

moreover good convincer makes buyer to trust and beleive it is reliable, before buying , a product first customer is buying you, your personality is trustfull, you are reliable person-so it is a step forward to make him buy a product you sell

even if it is not direct contact-i but Toyota because serouse company is manufacturing, service center is imagible, strong on the market many years even maybe modification is not that good versus price, but my mind buys toyota brand concept, and it is an obvious argument to convince me to buy the  toyota car 

first and foremost is convincing power, first you need to convince the customer to connect with you thereafter you would be able to develop credibility or trustworthiness.

Any good marketing personnel must have a powerful convincing power in appeal to the emotion  of the costumer on why he/she should by your goods

trust worthiness is the key to every relationship to prosper be it business or personal.

It depends on the competition, requirment,specification budget, for me building a trust is most important...either by convincing or trustworthiness

I think persons credibility & his convincing power play vital role in sales & marketing.........

but..

A new person entering in sales & marketing field, what should b he done..?