Which of the following will immediately and directly increase the firm's Free Cash Flow? $[$Select ALL that apply$]$

A$.$ The firm's logistics managers introduce a new Just In Time process which increases inventory turnover $($without affecting cost of sales$).$

B$.$ To reduce the impact of new tariffs to be introduced later this year, the firm builds up its stock of parts supplied from China.

C$.$ The firm's stock price rises $5\%$ in one day.

D$.$ To cope with the financial impact of COVID, the firm issues new zero coupon bonds.

E$.$ The firm invests in a new production facility in anticipation of increasing sales.

F$.$ The firm's purchasing department negotiate a longer period for paying suppliers.