# UGC-NET | UGC-NET CS 2017 Nov – III | Question 72

The Sigmoid activation function f(t) is defined as:

(A) $\frac{1}{exp(t)&space;+exp(-t)}$
(B) $t*exp(-t)$
(C) $\frac{1}{1&space;+&space;exp(t)}$
(D) $\frac{1}{1&space;+exp(-t)}$

Explanation: The Sigmoid activation function f(t) is defined as:
$\frac{1}{1&space;+&space;exp(t)}$
So, option (C) is correct.

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