If \[f(x)={{e}^{-x}},\] then \[\frac{f(-a)}{f(b)}\] is equal to

1.	If \[f(x)={{e}^{-x}},\] then \[\frac{f(-a)}{f(b)}\] is equal to
A.	\[f(a+b)\]
B.	\[f(a-b)\]
C.	\[f(-a+b)\]
D.	\[f(-a-b)\]
Answer» E.

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If \[f(x)={{e}^{-x}},\] then \[\frac{f(-a)}{f(b)}\] is equal to

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