Descride the period,position and function of a geostationary satellite

An object in such an orbit has an orbital period equal to the Earth's rotational period, one sidereal day, and so to ground observers it appears motionless, in a fixed position in the sky. ... Geostationary satellites are launched via a temporary orbit, and placed in a slot above a particular point on the Earth's surface.

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The answer would be the last one.

Checks and balances is all 3 branches (legislative, executive and judicial) checking each other so no branch is abusing their power.

Example: The legislative branch is checked by the executive branch because the president can veto a law