Which of the Following Describes the Effect of the Transformation $g(x)=\frac{f(7 x)}{7}$

Which of the following describes the effect of the transformation $g(x) =\frac{f(7 x) }{7}$ on the graph of the function $f$ ?

A) The graph is stretched vertically by a factor of 7 and stretched horizontally by a factor of 7.
B) The graph is stretched vertically by a factor of 7 and compressed horizontally by a factor of $\frac{1}{7}$ .
C) The graph is compressed vertically by a factor of $\frac{1}{7}$ and stretched horizontally by a factor of 7 .
D) The graph is compressed vertically by a factor of $\frac{1}{7}$ and compressed horizontally by a factor of $\frac{1}{7}$ .