Answer: The correct option is D.
Explanation:
The reciprocal function is in the form of rational function and negative exponent form.
The parent equation of reciprocal function is,
[tex]f(x)=\frac{1}{x}[/tex]
It can be written as,
[tex]f(x)=x^{-1}[/tex]
The domain of this function is all real numbers except 0 and range is all real number except zero.
Therefore, the correct option is D.
The function in option A and B are polynomial functions.
The function in option C is a modulus function.
Therefore, the options A,B and C are incorrect.
