$($e$)$ y $=$ f$(3$x$),$ which of the following is correct

Shift $3$ units upward.

Shift $3$ units downward.

Shift $3$ units to the right.

Shift $3$ units to the left.

Stretch the graph vertically by a factor of $3.$

Shrink the graph vertically by a factor of $3.$

Stretch the graph horizontally by a factor of $3.$

Shrink the graph horizontally by a factor of $3.$

Reflect about the x$-$axis.

Reflect about the origin