A quadrilateral ABCD has diagonal AC of length 28 cm. If the perpendicular drawn from vertices B and D to AC are 30 cm and 21 cm respectively, then find it area.

A

1428 $$cm^{2}$$

B

357.5 $$cm^{2}$$

C

710.5 $$cm^{2}$$

D

714 $$cm^{2}$$