_____ exchanges are open to any set of buyers and sellers within a given market and provide services and a common technology platform to their members.

Consider the following code which deletes all the nodes in a linked list.void doublyLinkedList::destroy(){  nodeType *temp; //pointer to delete the node  while (first != nullptr)  {     temp = first;     first = first->next;     ____}last  = nullptr;count = 0;}Which of the following is the missing statement?

A. delete first; B. delete temp; C. destroy temp; D. clear temp;

As programs become larger and more complicated, the need for good planning and design ____ .

A. decreases B. is inefficient C. is not necessary D. increases