What Makes a Publicly Held Corporation Different from a Public

What makes a publicly held corporation different from a public corporation?

A) A publicly held corporation has many shareholders rather than being a corporation owned by a governmental entity.
B) A publicly held corporation is entitled to limited liability,but a public corporation is not.
C) A publicly held corporation must have a charitable purpose,but a public corporation need not have a charitable purpose.
D) They are two terms that have the same meaning.