Which of the following statements are correct

A. Employment rent benefits workers but harms the firms as it implies higher production costs.

B. Piece rate payment is an appropriate way to pay employees working on a team project.

C. Positive employment rent implies that there must always be involuntary unemployment.

D. Firms pay workers more than their reservation options so that workers do not want to leave.

Select one:

a.B, C

b.A, C, D

c.A, C

d.C, D

e.B, D