How to calculate the area of a regular polygon?

The area of a regular polygon is equal to the result of multiplying the semiperimeter by the apothem.
The semiperimeter of a regular polygon is equal to half of its perimeter.
The apothem of a regular polygon is the distance from its center to the midpoint of one of its sides.
a) Only statement I is correct.
b) Statements I and II are correct.
c) Statements I, II, and III are correct.
d) None of the statements are correct.