The next two questions $(7-8)$ are based on the following:

In the following system, Process A and B produce same components that must be joined at process C$.$ Note that Process A and B produce same components, they are together considered a stage.

$7.$ The bottleneck of this system is $\_\_\_\_\_\_\_.$

$8.$ The throughput rate of the system $($in units per hour$)$ is $\_\_\_\_\_\_\_\_.$