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About Iterator Valid type Option both a and c is correct.. Iterators are classified into five categories depending on the functionality they implement: 1)Input 2)Output 3)Forward 4)Bidirectional 5)Random Access Input and output iterators are the most limited types of iterators: they can perform sequential single-pass input or output operations. Forward iterators have all the functionality of input iterators and -if they are not constant iterators- also the functionality of output iterators, although they are limited to one direction in which to iterate through a range (forward). All standard containers support at least forward iterator types. Bidirectional iterators are like forward iterators but can also be iterated through backwards. Random-access iterators implement all the functionality of bidirectional iterators, and also have the ability to access ranges non-sequentially: distant elements can be accessed directly by applying an offset value to an iterator without iterating through all the elements in between. These iterators have a similar functionality to standard pointers (pointers are iterators of this category). Mayur Gaikwad 07-2-2016 11:02 AM

five types of iterators iterators are classified into five categories depending on the functionality they implement: Input Output Forward Bidirectional Random Access Y.C. 09-9-2015 09:55 PM

c++ nice manish singj 09-1-2015 08:52 AM

Backward iterator is also a correct answer, question is a confusing game with words Backward iterator is also valid. If you say that backward and reverse are not the same thing then it's just a play with words and it means that the question is at least confusing. For example the: std::vector::rbegin Return reverse iterator to reverse beginning Returns a reverse iterator pointing to the last element in the vector (i.e., its reverse beginning). Reverse iterators iterate backwards: increasing them moves them towards the beginning of the container. stefan 05-30-2014 06:09 AM

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