Which of the following is correct?

A$.$ As long as a firm does not pay out $100\%$ of its earnings, the firm's annual profit that is retained in the business $($i$.$e$..$ the addition to retained earnings$)$ is another source of funds for a firm's expansion,

B$.$ The maximum growth rate that a firm can achieve with no access to external capital is called the firm's self$-$supporting growth rate. It can be calculated by using the AFN equation with AFN equal to zero and solving for g

C$.$ All of the above are correct

D$.$ None of the above is correct