Patricia, a Senior Employee Working in a State Museum, Retires

Patricia, a senior employee working in a state museum, retires from her job. She, however, does not receive the full benefits of her retirement plan as she did not fulfill the requirement laid down by the government. The government policies state that an employee of any government organization has to work in the same organization for at least 30 years for him or her to receive the retirement benefits. In this case, Patricia has failed to receive the benefits because she did not complete the _____.

A) grace period
B) benefit period
C) vesting period
D) upliftment period