Which of the Following Is True About Vesting Rights

Which of the following is true about vesting rights?

A) It includes the right to a pension prior to retirement age.
B) Employers may choose to vest employees after five years.
C) The right to a pension remains only if the vested employee is with the employer until retirement.
D) Transferring employees as a means of avoiding pension obligations is allowed.
E) Multiemployer pension plans do not take into consideration vesting.