Question

I HD answered almost every questions. Now it's time to ask some questions
U hv to be honest in this question and before asking I wanna tell that I already know the answer. So let's see what's the question
Question 1.
If f(x1) = f (x2) ⇒ x1 = x2 ∀ x1 x2 ∈ A then the function f: A → B is
(a) one-one
(b) one-one onto
(c) onto
(d) many o​

Answer 1

Answer:

a) one-one

Tell me if it is correct or not