What is the characteristic feature/condition of 'Improper Transfer Function' ?

What is the characteristic feature/condition of 'Improper Transfer Function' ?

a. Order of Numerator is greater than order of Denominator
b. Order of Numerator is equal to order of Denominator
c. Both
d. None

Correct Answer : a. Order of Numerator is greater than order of Denominator

Explanation :

Improper Transfer Function measures that the order of numerator must be greater than that of denominator, while proper transfer function measures that the degree of numerator should not exceed than the degree of denominator. A strictly proper function indicates that the degree of numerator must be less than the degree of denominator. Also, if the degree of numerator becomes equal to the degree of denominator, then the transfer function is known as 'Bi-proper Function'.