Let X = {0,1, 2} and Y = {0, 1, 2}. Now we define f={(0,1),(1,2).(2.1) Please enter your answer as a sum of the following numbers (they are not mutually exclusive): . 1 ifff is a function f : X Y 2 ifffis a function and it is also injective 4ifff is a function and it is also surjective This means that your answer can be 0 (not a function). 1 (a function but neither injective or surjective). 3 (a function that is only injective but not surjective), 5 (a function that is only surjective but not injective) or 7 (a function that is bijective)