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What is the chain rule in calculus?

A d/dx[f(g(x))] = f'(g(x)) × g'(x)

B d/dx[f(x) × g(x)] = f'(x)g(x) + f(x)g'(x)

C d/dx[f(x)/g(x)] = [f'g - fg']/g²

D d/dx[f(x) + g(x)] = f'(x) + g'(x)

✓ Correct Answer: Option A

The chain rule states that the derivative of a composite function f(g(x)) is f'(g(x)) multiplied by g'(x).

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