Which of the following is correct?

The following is a list of statements concerning investigation techniques

a. Questionnaires are an effective way of developing rapport with the business users.

b. Workshops are an effective way of obtaining user buy-in and acceptance.

c. Protocol analysis involves following a user for a period to find out what they do.

d. Scenarios can be used as an effective basis for the development of prototypes.

Which of the following is correct?
A . Statements a and c are incorrect, statements b and d are correct.
B. Statements a and d are incorrect, statements b and c are correct
C. Statements b and c are incorrect, statements a and d are correct.
D. Statements c and d are incorrect, statements a and b are correct.