Which of the following is true
Which of the following is true
- A
$p \Rightarrow q \equiv \;\sim p \Rightarrow \;\sim q$
- B
$\sim (p \Rightarrow \;\sim q) \equiv \;\sim p \wedge q$
- C
$\sim (\sim p \Rightarrow \,\sim q) \equiv \sim p \wedge q$
- D
$\sim (p \Leftrightarrow q) \equiv [\sim (p \Rightarrow q) \wedge \sim (q \Rightarrow p)]$
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