java

What does the following recursive method do, if called from another public method, where the parameter p is a reference to the tree root? private int undefined_Method(NodecInteger p) { if (p == null) return 0; if (p.left == null || p.right == null) return p.data; if (p.left != null && p.right = null) return (p.data +undefined Method(p.left) + undefined Method(p.right)); else return (undefined_Method(p.left) + undefined_Method(p.right)); } A It returns the summation of data of the leaf nodes and nodes having only a left child Bit returns the summation of data of the leaf nodes and nodes having only the right child It returns the summation of the data of all the nodes It returns the summation of data of leaf nodes and nodes having two child nodes