Melissa's retirement plan is described in her employee handbook as follows:
Noncontributory
Cliff vesting (100 percent) 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
a) Melissa's retirement benefits are based solely on her final salary.
b) Melissa's retirement benefits are determined by both her salary history and tenure with the company.
c) Melissa's retirement benefits are subject to fluctuations in the stock market.
d) Melissa's retirement benefits require her to contribute a portion of her salary.