This question tests vertical stretch of a function.
\( \begin{array}{l}\text{Describe the transformation from } y = f(x) \\\text{to } y = 3f(x).\end{array} \)
Select all correct options:
Check the coefficient in front of f(x) for vertical scaling.
Coefficient a > 1 stretches vertically; 0 < a < 1 compresses vertically.
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