In the Delphi method a $\_\_\_\_\_\_.$

Question $6$Answer

a$.$

group of experts, over the course of multiple rounds, makes short$-$term forecasts

b$.$

single expert, over the course of a single round, makes long$-$term forecasts

c$.$

single expert, over the course of multiple rounds, makes long$-$term forecasts

d$.$

group of experts, over the course of multiple rounds, makes long$-$term forecasts