Answer:
(I) using temporary workers.
(II) shifting demand from high-demand periods to low-demand periods
(IV) discovering bottlenecks.
Step-by-step explanation:
For reducing the waiting lines manager should be considered by using the temporary workers that help the company for any loss now if the demand is shifted from high to low it helps to manage the service level and for establishing the bottlenecks the problem is also solved
Therefore the first second and fourth part is chosen