Marleen is a 52-year-old participant in the XYZ cash balance plan. She has been a participant in the plan for the last twenty years. XYZ, which has over 10,000 employees, is having financial difficulty and Marleen is concerned about the security of her pension. Which of the following is correct?

A. The cash balance plan formula cannot be lowered in the future for current participants, but could be changed for new participants.

B. Termination of the plan may affect vesting for some employees, but Marleens vesting will not be impacted.

C. The cash balance plan assets may include up to 25% of XYZ stock.

D. The cash balance plan and its benefits are fully protected by the PBGC.