(a) Give code to implement the function QU4a, specified below. function QU4a(n in Int) return in Array of Int pre n>0. post The returned value is an array of size n containing 2 to n. For example, QU4a(4) = [2,3,4]. (b) A function QU4b is specified below, and is followed by a fragment of code using this function. Write down the states of the variable s after execution of the fragment. function QU4b(n in Int, s in Spot) return in Spot pre n0. post The returned value is an object of type Spot that is 2 places to the right of s and n places below it. var s in Spot s.upone () s