You need to define the high level project objectives .Which of the following technique is the best method to define the project objectives?

Delphi method is  the best 

Option-A -Delphi....................................................

Delphi technique is most commonly used to obtain expert opinion

Option (D). Cost benefit analysis

In my opinion  --    A. Delphi.    -----------------------------------

expert interviews -option c

Thanks for the interview.

It is C - Expert interviews.