下列代码实现从文件file.dat中读出第5个字节到变量c中，横线处应该填入下列项中的______。 import java.io.*; public class exl5 { public static void main(String[] args) { try System.out.println((char)c); catch(Exception e) { e.printStackTrace(); } } }

A．FileInputStream in = new FileInputStream("chl/fildat"); iskip(4); int c = iread();
B．FileInputStream in = new FileInputStream("chl/fildat"); iskip(5); int c = iread();
C．Fi2eInputStream in = new FileInputStream("fildat"); int c = iread();
D．RandomAccessFile in = new RandomAccessFile ("chi/fil dat "); iskip (4); int c = ireadByte();