Given $p$: $A$ man is a judge,$q$: $A$ man is honest. If $S_1$: If a man is a judge,then he is honest; $S_2$: If a man is a judge,then he is not honest; $S_3$: $A$ man is not a judge or he is honest; $S_4$: $A$ man is a judge and he is honest. Then:
- A$S_2 \equiv S_3$
- B$S_1 \equiv S_2$
- C$S_2 \equiv S_4$
- D$S_1 \equiv S_3$
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