The answer is A.
How to find which function is both continuous and differentiable for all x?
A is continuous:
⇒ x = 2
⇒ 2³ = 8
⇒ 4[3(2) - 4] = 8
D is undefined at x = -3
Differentiable means the derivative exists at every point in its domain.
Learn more about differentiable here: brainly.com/question/18760518
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