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Describe the transformation required to produce $y=\dfrac{1}{e^{x+2}}$ starting from $y=e^x$.

First reflect about the $y$-axis, then shift 2 units to the right.

Shift 2 units to the left.

First shift 2 units to the right, then reflect about the $y$-axis.

First reflect about the $x$-axis, then shift 2 units upward.