(1 point) Which of the following are trees and which are forests? C] A: Is a forest C] B: Is a forest C] A: Is a tree C] B: Is a tree C] C: Is a forest C] D: Is a forest C] C: Is a tree [3 D: Is a tree (1 point) Consider the function f : { 1, 2, 3, 4, 5} - {1, 2, 3, 4, 5 } given by 2 3 4 5 f = 4 2 1 5 5 a. Find f(1). b. Find a n in the domain such that f(n) = 1. c. Find an element n of the domain such that f(n) = n. d. Find an element of the codomain that is not in the range.(1 point) Write out all functions f : {1, 2, 3, 4} - {a, b } (using two-line notation). How many functions are there? How many are surjective? How many are injective? How many are bijective?(1 point) Write out all functions f : {1, 2} - {a, b, c, d } (in two-line notation). How many functions are there? How many are surjective? How many are injective? How many are bijective?