What will be the output of the following Java program?

import java.io.*;
class filesinputoutput
{
    public static void main(String args[])
    {
        InputStream obj = new FileInputStream("inputoutput.java");
        System.out.print(obj.available());
    }
}

Note: inputoutput.java is stored in the disk.

Which class is used to read data from the keyboard in Java?

A. Scanner

B. FileReader

C. BufferedReader

D. InputStream

What is the purpose of the `System.out.println()` method in Java?

A. It performs mathematical operations

B. It writes data to a file

C. It reads data from the keyboard

D. It prints data to the standard output stream followed by a newline

Which method is used to write data to a file in Java?

A. read()

B. print()

C. write()

D. scan()

How can you close a file after reading or writing in Java?

A. By using the `terminate()` method

B. By using the `close()` method of the file stream

C. By using the `readLine()` method

D. By using the `exit()` method