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/file.dat", "read")

B．RandomAccessFile("r", "ch1/file.dat")

C．RandomAccessFile("ch1/file.dat" , "r")

D．RandomAecessFile("read", "ch1/file.dat")