A、 OutputStream out= new FileOutputStream (“file.txt”);   Out.writeBytes (“ /n”); B、 OutputStream os= new FileOutputStream (“file.txt”, true);   DataOutputStream out = new DataOutputStream(os);  out.writeBytes (“ /n”); C、 OutputStream os= new FileOutputStream (“file.txt”);   DataOutputStream out = new DataOutputStream(os);  out.writeBytes (“ /n”); D、 OutputStream os= new OutputStream (“file.txt”, true);   DataOutputStream out = new DataOutputStream(os);  out.writeBytes (“ /n”);