B. Using the output of the first function as the input of the second function.
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This question is solved using the composite functions concept.
Composite function:
Suppose we have two functions, f and g. The composite function of f and g is:
[tex](f \circ g)(x) = f(g(x))[/tex]
Now, the composite of g and f is:
[tex](g \circ f)(x) = g(f(x))[/tex]
That is, the output of the first function is the input of the second function, and the correct answer is given by option B.
A similar question is given at https://brainly.com/question/22855587
