the degree of numerator and denominator are unequal

[C].

the degree of numerator is one more than degree of denominator

[D].

the degree of numerator is one less than degree of denominator

Answer: Option A

Explanation:

If degrees of numerator and denominator were unequal, a pole or zero can be removed. Such a function cannot be a minimum function. Therefore degrees of numerator and denominator must be equal.