Which of these classes can return more than one character

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Which of these classes can return more than one character to be returned to input stream?

1. CharArrayReader
2. PushbachReader
3. BufferedReader
4. Bufferedwriter
5. None of these

Correct Option: B

PushbackReader class allows one or more characters to be returned to the input stream. This allows looking ahead in input stream and performing action accordingly.