Consider the following C program segment struct CellNode { struct CellNode *leftChild ; int element; struct CellNode *rightChild ; }; int DoSomething (struct CellNode *ptr) { int value = 0 ; if (ptr ! = NULL) { if (ptr->leftChild ! = NULL) value = 1 + DoSomething (ptr - > leftChild); if (ptr - > rightChild ! = NULL) value = max (value, 1 + DoSomething (ptr - > rightChild)) ; } return (value); } The value returned by the function do something when a pointer to the root of a non-empty tree is passed as argument is