Given the function $y = a \, e^{b \, x + c}$ where $a$, $b$, and $c$ are all constants. If $b = -1$ and $c$ is changed from $2$ to $-1$, what effect will this have on the curve representing $y$?

A. It will shift upwards
B. It will shift downwards
C. It will shift to the right
D. It will shift to the left
E. It will be stretched vertically
F. It will be compressed vertically
G. It will be stretched horizontally
H. It will be compressed horizontally
I. It will be mirrored about the x-axis
J. It will be mirrored about the y-axis
K. Some combination of at least two of the above