For the Reciprocal Function Defined By $f(x)=\frac{1}{x^{\prime}}$ _______Is the Only Real Number Not in the Domain

Multiple Choice

For the reciprocal function defined by $f(x) =\frac{1}{x^{\prime}}$ _______is the only real number not in the domain.

A) 1
B) $\frac{1}{2}$
C) 0
D) -1