The length of a room exceeds its breadth by 2 meters. If the length be increased by 4 meters and the breadth decreased by 2 meters, the area remains the same. Find the surface area of its walls if the height is 3 meters?

A

$$ 248m^{2} $$

B

$$ 48m^{2} $$

C

$$ 84m^{2} $$

D

$$ 56m^{2} $$

E

$$ 260m^{2} $$