The diagram below shows a balanced lever with boxes on either end. D1 and D2 down F1 and F2.

What equation would reflect that the lever is balanced?
A) F1 x D1 = F2 x D2
B) F1 + D1 = F2 + D2
C) F1 x F2 = D1 x D2
D) F1 + F2 = D1 + D2