The First Part of the Pension Protection Act of 2006

The first part of the Pension Protection Act of 2006 (PPA) modified ERISA. Which of the below was NOT a major modification?

A) It required underfunded plans to pay additional premiums to the Pension Benefit Guaranty Corporation (PBGC) .
B) It tightened the requirement for companies terminating their pension plans to provide extra funding to the pension system.
C) It closed loopholes that allowed underfunded plans to skip pension payments.
D) It required that companies measure their pension plan obligations more accurately.