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Which of the following is an incorrect declarations of iterators for STL containers? You may assume that the proper header has been included and that a using directive makes the names from namespace std available.

A. vector::iterator vecIterator; B. list::iterator listIterator; C. deque::iterator dequeIterator; D. list::iterator listIterator;

Typically, a program communicates with the operating system through __________.

a. an application programming interface b. the command language c. the user interface d. none of the above