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estion 11 t yet wered rked out of 0 Flag question Which of the following calculates the exact height of an AVL tree? O A. if (node == null) O B. C. return 0; return 1 + max (a: FUN (node: node.left), b: FUN (node: node.right)); if (node == null) return -1; return 1 + max (a: FUN (node: node.left), b: FUN (node: node.right)); if (node == null) return 1 + max (a: FUN (node: node.left), b: FUN (node: node. right)); return -1; O D. if (node == null) return 0; return max (a: FUN (node: node.left), b: FUN (node: node.right));