How many singly$-$linked Node objects could the Java Virtual Machine mark as

"garbage" after all the following statements have executed?

Node $n=$ null;

n $=$ new Node$("$T$")$;

n$.$next $=$ new Node$("$I$",$ new Node$("$G$"))$;

Node $m=n.$next.next;

m$.$next $=$ new Node$("$E$",$ new Node$("$R$"))$;

$n=$ null;

A$.2$

B$.3$

C$.4$

D$.5$

What I understand is n $=$ T $->$ I $->$ G $.$ Then m $=$ n$.$next.next. So$,$ m$=$ G $->$ E $->$ R $.$ Then n $=$ null. So$,$ the answser is $2$ which is A$.$ right? If it's wrong, please give me some details.