If A= (a,b,c), B= (1, 2, 3), f= {(a,1), (b,1), (c,1)) then it is?

Onto function

One-one function

Identity function

Constant function

The function f is defined as f(a) = 1, f(b) = 1, and f(c) = 1.
This means that every element in the domain (A) is mapped to the same element (1) in the codomain (B).
This is a characteristic of a constant function, which is a function that always returns the same output value regardless of the input.