Melissa's Retirement Plan Is Described in Her Employee Handbook as Follows

Melissa's retirement plan is described in her employee handbook as follows:
Noncontributory
Cliff vesting (100%) after 3 years of full-time employment
Monthly retirement benefits based on average salary over the last 3 years of employment and the total number of years worked for the company
Which of the following statements about this retirement plan is true?

A) Melissa will have to pay money into the plan.
B) If Melissa leaves this company before working full time for 3 years, she will not receive any benefits.
C) Melissa will have to make investment decisions regarding her retirement plan.
D) Melissa's retirement plan is a defined contribution plan.
E) For Melissa, vesting takes place gradually over the first 3 years of employment.