QUESTION $21$

Questionnaires are sent to a select group of experts, whose responses are collated and reviewed, and then a summary is returned to the group with a follow$-$up questionnaire. Again, the experts provide their answers. The process continues until the group agrees on a common answer and a decision is reached. This describes the process of which type of team decision$-$making?

a$.$ brainstorming

b$.$ nominal group technique

c$.$ rational decision$-$making technique

d$.$ Delphi technique