The table below shows the relationships between the area and perimeter of four squares.

Squares
Area, A (square units): 16, 25, 36, 49
Perimeter, P (units): 16, 20, 24, 28

Which equation can be used to find A, the area of a square that has a perimeter of P units?
A) A = P × 4
B) A = (P + 4)
C) A = (P ÷ 4) × (P ÷ 4)
D) A = (P × 4) ÷ 4