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# Which of the following are contact forces?

**A**. Friction

**B**. Gravitational force

**C**. Magnetic force

**D**. Muscular force

$(a)$. A and B

$(b)$. B and C

$(c)$. A and D

$(d)$. B and D

Friction force and muscular force can't act without contact.

So, (A) and (D) is correct.

Therefore option (c) is correct.

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