Consider a scenario where we pool two identical single$-$server systems into one pooled system $($this means the utilization of each server is unchanged$).$ This will reduce wait time. A similar magnitude of reduction in wait time could instead be achieved by:

Doubling the variability factor

Cutting the variability factor by $67\%$

Cutting the variability factor by $50\%$

Cutting the variability factor by $33\%$