Which of the following are key decisions a perfectly competitive firm has to make?

Which of the following are key decisions a perfectly competitive firm has to make?

:

A) whether to stay in the industry or leave it.

B) after the decision is made to produce a certain amount of output, what price to charge for the product.

C) if the decision is to produce, how much to produce.

D) if the decision is to stay in the industry, whether to produce or temporarily shutdown.

E) whether to exit or enter the industry.

F) all of the above

G) none of the above