What does the following recursive method determine?

public boolean question$16($int$[]$a$,$ int$[]$ b$,$ int j$)$

$\backslash \{$

if $(\backslash (\backslash$mathrm$\{$j$\}==\backslash )$ a$.$length$)$ return false;

else if $(\backslash ($ j$==\backslash )$ b$.$length$)$ return true;

else return question$16($a$,$ b$,$ j$+1)$;

$\backslash \}$

returns true if $\backslash ($ a $\backslash )$ and $\backslash ($ b $\backslash )$ are equal in size, false otherwise

returns true if $\backslash ($ a $\backslash )$ is larger than $\backslash ($ b $\backslash ),$ false otherwise

returns true if $\backslash ($ b $\backslash )$ is larger than $\backslash ($ a $\backslash ),$ false otherwise

returns true if $\backslash ($ a $\backslash )$ and $\backslash ($ b $\backslash )$ have no elements

returns the length of array $\backslash ($ a$+\backslash )$ length of array $\backslash ($ b $\backslash )$