The contra positive of $$p \rightarrow(q \rightarrow r)$$ is equivalent to

A

$$(\sim q \wedge r) \rightarrow p$$

B

$$(q \wedge \sim r) \rightarrow \sim p$$

C

$$(q \wedge\sim r) \rightarrow p$$

D

$$p \rightarrow (q \wedge \sim r)$$