Civics Help meh :/

Which of the following is not a regulation that a political action committee (PAC) must follow?

A) PACs can only donate $5,000 per year to another PAC.

B) PACs cannot donate directly to specific candidates.

C) PACs must register with the Federal Election Committee (FEC) within ten days of their formation.

D) PACs may only donate $15,000 per year to a national political party committee.