Which XXX completes the Java OpenAddressingBucket class's isEmpty$()$ method?

boolean isEmpty$()\{$

return XXX $||$ this $==$ EMPTY$\_$AFTER$\_$REMOVAL;

$\}$

Group of answer choices

this $==$ null

this $==$ EMPTY$\_$SINCE$\_$START

this $!=$ FULL

this.key $==$ this.value