有关下面 C++ 代码的说法正确的是（ ）。

class Node
{
public:
    int Value;
    Node* Prev;
    Node* Next;
    Node(int Val, Node* Prv = NULL, Node* Nxt = NULL);
};

Node::Node(int Val,Node*Prv,Node* Nxt)
{
    this->Value = Val;
    this->Prev = Prv;
    this->Next = Nxt;
}

int main()
{
    Node firstNode = Node(10);
    firstNode.Next = new Node(100, &firstNode);
    firstNode.Next->Next = new Node(111, firstNode.Next);
}