The code segment below is intended to set the boolean variable duplicates to true if the int array arr contains any pair of duplicate elements. Assume that arr has been properly declared and initialized.

boolean duplicates $=$ false;

for $($int x $=0$; x $<$ arr.length $-1$; x$++)$

$\{$

$/*$ missing loop header $*/$

$\{$

if $($arr$[$x$]==$ arr$[$y$])$

$\{$

duplicates $=$ true;

$\}$

$\}$

$\}$

Which of the following can replace $/*$ missing loop header $*/$ so that the code segment works as intended?