The United States (US) president Joe Biden has also served as

Q. The United States (US) president Joe Biden has also served as
(A) vice president
(B) defence secretary
(C) CIA director
(D) speaker US house of representatives

The answer is: (A) vice president
The US president-elect Joe Biden has also served as vice president from 20 January 2009 to 20 January 20 2017.