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What is the output returned by Console if ReadLine() stores I/O error?

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What is the output returned by Console if ReadLine() stores I/O error?

(a) 1

(b) 0

(c) False

(d) I/O EXCEPTION ERROR

I have been asked this question in homework.

My question is from Reading Console Input Operations topic in section Console I/O Operations and Stream Classes of C#

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Best answer
The correct answer is (d) I/O EXCEPTION ERROR

The best I can explain: None.

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