Consider the condition $($c$1==$ c$2).$ Which of the following are guaranteed to cause the condition to be true?

$($zero$,$ one, or more answers may be correct$)$

int$[]$ c$1=$ new int$[10]$;

int$[]$ c$2=$new int$[$c$1.$length$]$;

boolean c$1=$ true $,$ c$2=$ c$1$;

City c$1=$ new City $("$DC$",200)$;

City c$2=$ new$($c$1)$;

char$[]$ c$1=$ new char$[5]$;

char$[]$ c$2=$ c$1$;