Milton, a manager, is forced to turn down an idea for a new product from Steven, one of his most creative team members because of financial limitations$.$ In order to prevent Steven from feeling discouraged, Milton should

$$ a$.$ suggest that frequently used approaches to problems should be used

b$.$ give gentle feedback to Steven when turning down the idea

c$.$ encourage him to work toward a single solution for problems

d$.$ recommend convergent thinking to improve Steven's creativity