For a set A ={1, 2, 3}, the following functions are defined from A to…

The correct answer is Option (1) → $f_1$= {(1, 1), (2, 2), (3, 3)}

for a function to have inverse it must be bijective

⇒ only $f_1$ is bijective in nature

i.e. one-one and onto

⇒ its inverse exist