Consider the function p(x)=(x+1)e−x. Which statement best describes the critical point at x=0?
a) It is a local minimum because p′′(0)>0.
b) It is an inflection point because p′′(0)=0.
c) It is a local maximum because p′′(0)<0.
d) It is neither a maximum nor a minimum because p′(0)=0.