在下列程序的横线处填入正确的语句，实现RandomAccessFile类使用。package ch1;import java. io. *;public class ex27{ public static void main(String args[] ) { try { RandomAccessFile in = new in.close ( );}catch (Exception e){ e.printStackTrace ();} } }

A．RandomAccessFileC"ch1/fildat", "read")

B．RandomAccessFile("r", "ch1/fildat")

C．RandomAccessFile("ch1/fildat" , "r")

D．RandomAecessFile("read", "ch1/fildat")