If p and d are pitch and gross diameter of rivets, the efficiency $$(\eta)$$of the riveted joint is given by

A

$$ \eta=\frac{p}{p-d}$$

B

$$ \eta=\frac{p}{p+d}$$

C

$$ \eta=\frac{p-d}{p}$$

D

$$ \eta=\frac{p+d}{p}$$