Which of the following is true on the basis of above diagram?

‘f’ is a function from A → B ‘f’ is one-one function from A → B ‘f’ is onto function from A → B ‘f’ is not a function from A → B

‘f’ is not a function from A → B

1. → false as item 'a' in A has two images 2, 3. → false, as f is not a function first 4. → True Option: 4