If the following code is run in a single thread, select either:

The current value of the semaphore after the previous line executed

"Thread starts waiting" if executing the previous line causes the thread to wait

$"$N$/$A$"$ if the previous line does not execute because the thread is stuck

sem$\_$init$($&sem, $4)$;

sem$\_$post$($&sem$)$;

sem$\_$wait$($&sem$)$;

sem$\_$wait$($&sem$)$;

sem$\_$wait$($&sem$)$;

sem$\_$post$($&sem$)$;

sem$\_$wait$($&sem$)$;

sem$\_$wait$($&sem$)$;

$9.$ sem$\_$wait$($&sem$)$;

$[$ Select $]$

$10.$ sem$\_$post$($&sem$)$;

$[$ Select $]$

$11.$ sem$\_$wait$($&sem$)$;

$[$ Select $]$

$12.$ sem$\_$wait$($&sem$)$;

$[$ Select $]$

$13.$ sem$\_$wait$($&sem$)$;

$[$ Select $]$

$14.$ sem$\_$post$($&sem$)$;

$[$ Select $]$

$15.$ sem$\_$wait$($&sem$)$;

$[$ Select $]$

$16.$ sem$\_$wait$($&sem$)$;

$[$ Select $]$