Which XXX defines a finally block to close a file? public class FileReadChars {    public static void main(String[] args) {        FileReader fileReader = null;       String fileName;       int charRead;       charRead = 0;       fileName = "file.txt";       try {          System.out.println("Opening file " + fileName + ".");          fileReader = new FileReader(fileName);          System.out.print("Reading character values: ");          while (charRead != -1) {             charRead = fileReader.read;             System.out.print(charRead + " ");          }          System.out.println();       }       catch (IOException excpt) {          System.out.println("Caught IOException: " + excpt.getMessage());       }      finally {          try{             XXX          }          catch (IOException excpt) {             System.out.println("Caught IOException: " + excpt.getMessage());          }          }      } } ----- fileReader.close(); if (fileReader == null){ fileReader.close(); } if (fileReader != null){ fileReader.close(); } close(fileReader);单项选择题

A

3

B

1

C

4

D

2

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