the correct answerWhich of these class is used to read characters in a file?OptionsFileReaderFileInputStreamFileWriterInputStreamReader

To determine which class is used to read characters in a file from the given options, let's analyze each class's primary function:

1. FileReader: This class is specifically designed for reading the character files. It is part of the java.io package and can be used to read text files in character form.

2. FileInputStream: This class is used to read raw bytes from a file. While it can be used in combination with InputStreamReader to read characters, it does not read characters directly.

3. FileWriter: This class is used for writing character files. It is not used for reading.

4. InputStreamReader: This class bridges byte streams to character streams; it reads bytes and decodes them into characters using a specified charset. It's used for reading streams of bytes as characters but usually requires a FileInputStream or similar stream to read from.

Conclusion

The correct answer is FileReader, as it is specifically meant for reading characters from a file.