The public corporation among the options listed is the National Electric Power Authority (NEPA). A public corporation is a legal entity established by the government to carry out specific public functions. NEPA was a government-owned utility company responsible for generating, transmitting, and distributing electricity across Nigeria before it was restructured and privatized into various successor companies. The other options listed are private corporations or limited liability companies that are owned and operated by private individuals or organizations for profit-making purposes.