Code example $9-1$

import java.io$.*$;

public class TestFileReader $\{$

public static void main$($String$[]$ args$)\{$

try $($BufferedReader in $=$ new BufferedReader$($

new FileReader$("$a$.$txt$")))\{$

String line $=$ in$.$readLine$()$;

while $($line $!=$ null$)\{$

String$[]$ v $=$ line.split$("$::$")$;

String lname $=$ v$[0]$;

String fname $=$ v$[1]$;

String dept $=$ v$[2]$;

System.out.println$($fname $+""+$ lname $+",$ dept $"+$ dept$)$;

line $=$ in$.$readLine$()$;

$\}$

$\}$ catch $($FileNotFoundException e$)\{$

System.out.println$("$File not found."$)$;

$\}$ catch $($IOException e$)\{$

System.out.println$("$I$/$O error."$)$;

$\}$

$\}$

$\}$

$($Refer to code example $9-1.)$ What delimiter is used to separate fields in the a$.$txt file?

Group of answer choices

a backslash