How is free cash flows $($FCF$)$ defined?

Multiple choice question.

FCF is the cash available for common stock dividends once the preferred dividends have been paid.

FCF is the cash available for distribution to the investors of the firm if no additional investments are made.

FCF is the cash available for distribution to the investors of the firm after the investments are made to sustain the firm's ongoing operations.

FCF is another term for the operating cash flows.