Given the Node Class Discussed in Section 17

Given the Node class discussed in section 17.1 (partially shown below) , select a statement to complete the recursive method descendants, which is designed to return the number of descendants of a node. class Node
{
Public Object data;
Public List<Node> children;
) . .
Public int descendants()
{
Int num = 0;
For (Node child : children)
{
_____________________________
}
Return num;
}
}

A) num = child.descendants() ;
B) num = num + child.descendants() ;
C) num = num + child.children.size() ;
D) num = num + child.descendants() + 1;