template ____ doublyLinkedList::isEmptyList() const{   
  return (first == nullptr);}
Consider the accompanying statements. The operation returns true if the list is empty; otherwise, it returns false. The missing code is ____.

Let G be a weighted graph. Let u and v be two vertices in G, and let P be a path in G from u to v. The weight of the path P is the sum of the weights of all the ____________________ on the path P.

Fill in the blank(s) with the appropriate word(s).

Recursive algorithms are implemented using while loops.

Answer the following statement true (T) or false (F)