Consider the following Scala function definition. (xs : List [X], ys : List [X]) List(X] [X] xs match f def f : { = case Nil => ys If this function is executed on two lists of length Mand Nrespectively, what is the length of the resulting list? M+N-2 M+N-1 M+N 2M+2N-1 2M+2N