Consider a $3-$stage process at a dentist clinic. The capacity of each stage is listed below.

Which statement below is CORRECT?

There may be more than one correct choice. Select ALL that apply. $($Difficulty Level $-$ Hard$)$

If the demand rate is $4$ patients$/$hour$,$ capacity expansion at the current bottleneck is necessary.

If the capacity of the current bottleneck is doubled, the new process capacity is $12$ patients$/$hour$.$

If the capacity of the current bottleneck is doubled, the new process capacity is $8$ patients$/$hour$.$

If the capacity of the current bottleneck is doubled, the new process will have $2$ bottlenecks.