Consider the following method.

publ ic stat ic St r ing abMethod$($St r ing a$,$ St r ing b$)$

$\{$

int x $=$ a$.$ indexOf$($b$)$ ;

whi le $($x $>=0)$

$\{$

a $=$ a$.$subst r ing$(0,$ x$)+$ a$.$subst r ing$($x $+$ b$.$ length$())$ ;

x $=$ a$.$ indexOf$($b$)$ ;

$\}$

return a;

$\}$

What, if anything, is returned by the method call abMethod$("$sing the song", $"$ng$")?$

$($A$)"$si$"$

$($B$)"$si the so$"$

$($C$)"$si the song"

$($D$)$ "sig the sog"

$($E$)$ Nothing is returned because a St r ingIndexOutOfBoundsExcept ion is thrown