A Rectangle Has Perimeter 14 M $A(l)$ Of the Length $l$ Of One of Its Sides

Multiple Choice

A rectangle has perimeter 14 m. Express the area of the rectangle as a function $A(l)$ of the length $l$ of one of its sides.

A) $A(l) =7 l-l^{2}$
B) $A(l) =l-7 l^{2}$
C) $A(l) =14 l-l^{2}$
D) $A(l) =14 l+l^{2}$
E) $A(l) =7 l+l^{2}$