(d) The contrapositive of $p \rightarrow \sim q$ is $\sim ( \sim q) \rightarrow \sim p$ or $q \rightarrow \sim p$ Also, converse of $q \rightarrow \sim p$ is$\ \sim p \rightarrow q$.
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.