Which of the follow BEST summarizes the purpose of Section 4 of the 25th Amendment?
a. It provides a check on presidential power in times of war.
b. It provides a way for the president to retain his power, even if he is impeached.
c. It outlines the procedures to be followed in the case that the vice presidency is vacant.
d. If the president is incapable, or unfit to perform his duties, this section provides a means of removing the president from office.

Which of the follow BEST ...