Evelyn manages a high$-$end Italian restaurant downtown. One evening while checking on guests, she overhears a group of customers complaining about how slow the service is$.$ Which of the following is the most effective control action Evelyn can take to resolve the problem?

Multiple Choice

She can simply take the customers' word for it and discipline her employees.

She can watch her employees work to determine the cause of the problem and then respond appropriately.

She can offer her employees incentives to speed up their work.

She can speed up the service by doing all the work herself.

She can fire all the employees and hire new ones.