At $x=0,$ the function $f(x)=x^{3}+1$ has
(A) a maximum value
(B) a minimum value
(C) a singularity
(D) a point of inflection
At $x=0,$ the function $f(x)=x^{3}+1$ has
(A) a maximum value
(B) a minimum value
(C) a singularity
(D) a point of inflection