The function f defined by f(x)=(x+2)e^(-...

The function `f` defined by `f(x)=(x+2)e^(-x)` is

A

Decreasing for all x

B

Decreasing in `(-oo, -1)` and increasing in `(-1, oo)`

C

Increasing for all x

D

Decreasing in `(-1, oo)` and increasing in`(-oo, -1)`

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The correct Answer is:

D

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