Which refers to the president's military role?
a. chief justice
b. chief executive
c. commander in chief
d. chairman of the joints chiefs

The answer is "C. Commander in chief".

A commander-in-chief, likewise in some cases called supreme commander is the individual or body that practices supreme operational direction and command over a country's military powers. As a specialized term, it alludes to military abilities that dwell in a country state's official initiative—a head of state or a head of government .  

Frequently, a given nation's president (whenever held by an official) require not be or have been an authorized officer or even a veteran. In these nations this pursues the guideline of regular citizen control of the military.

~kinetic ~potential

explanation:

kinetic and potential energies would be types of mechanical energies.

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