The proposition $ (p \Rightarrow \: ^{\sim}p) \wedge (^{\sim}p \Rightarrow p)$ is a

Question

$\begin {array} {1 1} (A)\;tautology\: and\: contradiction & \quad (B)\;neither\: tautology\: nor \: contradiction \\ (C)\;contradiction & \quad (D)\;tautology \end {array}$