To reduce waiting times by actively managing system constraints, managers could consider:

$($I$)$ using temporary workers.

$($II$)$ shifting demand from high$-$demand periods to low$-$demand periods.

$($III$)$ offering more service variety.

$($IV$)$ discovering bottlenecks.

Multiple Choice

I and III only

I, II$,$ and IV only

III only

II and IV only

IV only