Which of the below stated functions are called as "Delta Function" ?

Which of the below stated functions are called as “Delta Function”?

a. Ramp Function
b. Step Function
c. Impulse Function
d. Periodic Function

Correct Answer : c. Impulse Function

Explanation :

Impulse function is distinguishably acquainted with a pulse that has infinite amplitude along with zero width under the consideration of unit area & hence 'δ' is the notational feature especially used for impulse (delta) function.