Concept:A public corporation is a statutory body created by law to manage specific public services with a measure of independence from the regular civil service.
Explanation:A public corporation is established through a law passed by the legislature.
This law is formally known as an act of parliament.
The act defines the corporation's powers, duties, and area of operation.
It is described as semi-independent because it controls its own day-to-day administration.
Nevertheless, it still answers to the government and must follow the provisions of its enabling statute.
It is not created by a civil service commission, a private sector initiative, or a free zones board.
These bodies do not possess the legal authority to set up a public corporation.
Therefore, the only valid means of establishment is through an act of parliament.
Answer:A. an act of parliament