Choose the appropriate method for each class.$$

ClassA:

public class ClassA implements Comparable$\{$

private String var;

public ClassA$($String var$)\{$

this.var $=$ var;

$\}$

public String getVar$()\{$

return var;

$\}$

public int XXX$($ClassA o$)\{$

return var.XXX$($o$.$var$)$;

$\}$

$\}$

ClassB:

public class ClassB implements Comparator $\{$

@Override

public int YYY$($ClassA o$1,$ ClassA o$2)\{$

return o$1.$getVar$().$length$()-$ o$2.$getVar$().$length$()$;

$\}$

$\}$

$$

What should XXX and YYY be$?$

Group of answer choices

XXX is compare and YYY is compareTo

Both are compareTo

Both are compare

XXX is compareTo and YYY is compare