Given the function $y=g\left(x\right)$, how would the graph of $y=-5g\left(x\right)$ differ from the original graph?

The graph is reflected across the $y$-axis and stretched vertically by a factor of $5$.

The graph is reflected across the $x$-axis and stretched vertically by a factor of $5$.

The graph is shifted $5$ units to the right.

The graph is reflected across the $x$-axis and stretched horizontally by a factor of $5$.