Which of the following statement is correct? (a) The laws for derived forces are independent as ...

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Which of the following statement is correct?
(a) The laws for derived forces are independent as the laws of fundamental forces in nature.
(b) Like gravitational force, electromagnetic force acts over large distances and does not need any intervening medium.
(c) Gravity is always attractive while electromagnetic force is repulsive.
(d) The weak nuclear force is not as weak as electromagnetic force but weaker than the strong nuclear force.
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