Given the following tree, show the contents of the run-time stack when Insert(Tree, 14) is executed. In the Return column, use RO, R1, or R2. RO is the initial, non-recursive call; R1 is the call to Insert(tree> left); R2 is the call to Insert(tree->right). Use the notation 10 to represent the node whose value is 1 10 15 12 17 What is put on the stack with call 4? Select one: OA. There is no fourth cal. B. NULL and R2 O C. 12 and R1 O D. NULL and R1