The twoInARow method below is intended to return true if any two consecutive elements of the parameter arr are equal in value and return false otherwise.

public boolean twoInARow$($int$[]$ arr$)$

$\{$

$/*$ missing loop header $*/$

$\{$

if $($arr$[$k$]==$ arr$[$k $+1])$

$\{$

return true;

$\}$

$\}$

return false;

$\}$

Which of the following can be used to replace $/*$ missing loop header $*/$ so that the method will work as intended?