Can someone please answer and explain this questionGiven the following code, which shows the source code line number $...$

$1$: public class Scope$\{$

$2$: public static void main $($String$[]$ args$)\{$

$3$: String one, two;

$4$: one $="$a$"$;

$5$: two $="$b$"$;

$6$: one $=$ two;

$7$: String three $=$ one;

$8$: one $=$ null;

$9$: $\}$

$10$: $\}$

$...$ at which line is every reference to a specific object lost?

$8$

$6$

$5$

$7$