Question: Hello can you please help me answer this question. Given a function f, which of the following represents a vertical stretch by a factor of

Hello can you please help me answer this question.

Given a function f, which of the following represents a vertical stretch by a factor of 4? Choose the correct answer below. X O A. f - f (x ) O B. 4 O c. f(4x ) O D. 4f(x)
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