Use the graph of the function $f(x)=1/(1+e^{1/x})$ to state the value of each limit.
If it does not exist, enter "n" below. If the answer is infinite, use "i" to represent infinity.
(a) $\displaystyle \lim_{x \to 0^-} f(x)$
(b) $\displaystyle \lim_{x \to 0^+} f(x)$
(c) $\displaystyle \lim_{x \to 0} f(x)$

(a)
(b)
(c)