Which of these values is returned by read() method is end

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Which of these values is returned by read() method is end of file (EOF) is encountered?

1. -1
2. 1
3. 0
4. Null
5. None of these

Correct Option: A

Each time read() is called, it reads a single byte from the file and returns the byte as an integer value. read() returns -1 when the end of the file is encountered.