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Which of the following is correct about Input Iterators?

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Which of the following is correct about Input Iterators?

(a) They cannot be decremented

(b) Cannot be used in multi-pass algorithms

(c) Can only be incremented

(d) All of the mentioned

I had been asked this question during an interview.

This intriguing question originated from Iterators in portion Algorithms, Objects & Iterators in C++ of C++

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Best answer
The correct option is (d) All of the mentioned

Best explanation: Input iterators can only be incremented and as it cannot be decremented it can be used in single-pass algorithms only.

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