The area (in square units) of the region bounded by the curve $x^2 = 4y$, the line $x=2$ and the $x$-axis is equal to :

Question

( A ) $\frac{4}{3} sq. unit$
( B ) $\frac{2}{3} sq.unit$
( C ) $1 \;sq. unit$
( D ) $\frac{8}{3} sq.unit$