Two straight poles of unequal length stand upright on a ground. The length of the shorter pole is 10 metres. A pole joins the top of the two vertical poles. The distance between the two tops is 5 metres. The distance between the poles along the ground is 4 metre. The area thus, formed by the three poles with the ground is:

A

52 $$m^2$$

B

46 $$m^2$$

C

20 $$m^2$$

D

50 $$m^2$$