All except one is not a corporation and boards at the federal level
Answer Details
All the options listed are corporations, however only one of them is not a corporation at the federal level.
FRCN, NNPC, and CBN are all federal corporations in Nigeria. FRCN stands for Federal Radio Corporation of Nigeria, NNPC stands for Nigerian National Petroleum Corporation, and CBN stands for Central Bank of Nigeria.
MAN, on the other hand, stands for the Manufacturers Association of Nigeria, which is a private sector body representing the interests of manufacturers in Nigeria. It is not a corporation at the federal level.