Which of the following will form the composite function g(f(x)) shown below?
g(f(x))=5(x-7)squared-4
a. f(x)=(x-7)square and g(x)=-4
b. f(x)=xsquared-4 and g(x)=x-7
c. f(x)= x-7 and g(x)= 5xsquared-4
d. f(x)= 5x-4 and g(x)= (x-7)squared