Please select all that apply with respect to a mutex.

Please select all that apply with respect to a mutex.

It's a synchronization primitive.

Can ONLY be used specifically to track ONE instance of a resource as 'available' or 'free' $($binary only$).$

Supports the special operations down$()$ and up$().$

Tracks 'wakeup' signals.

Can be used to track any number of resources of the same kind as 'available' still for use from a pool of available resources.

Can be used to tackle the Producer$-$Consumer $($P$-$C$)$ Problem.

Allows one process to 'signal' another.