C++ MQCs with Explanation ( STANDARD TEMPLATE LIBRARY)

Which one of the following is TRUE?

1. Algorithms can be used only on STL containers
2. An iterator can always move forward or backward through a container
3. The back( ) member function removes the element at the back end of the container
4. The member function end( ) returns a reference to the last element in the container

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Answer: 

Option b: An iterator can always move forward or backward through a container

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Explanation Here