A single machine has an average processing time of $18$ minutes per part with a standard deviation of $1\mathrm{.}5$ minutes. The manager is thinking of purchasing a more automated machine for this process that will have a constant processing time of $18$ minutes. In both cases the mean arrival rate will remain the same at four parts per hour and the variability in arrival will be identical. The effect of changing to the automated machine will be two:

increase the average queue time or decrease long term utilization or increase long term utilization or decrease the average queue time