This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to use social distancing for retail businesses in pandemic
Set up a mobile queuing system.
It can be manual or automated with an application.
Issue a queue number to a waiting customer.

Options:
- Take a customer's order to start the queue. The queue number will then be displayed to the right when a customer gets on line or enters the middle of the line.
- You will then receive a notification when the queueing process is complete. Decide how to choose a queue option.
- Send the final customer a significant text message and ask them to register for an application. Assign who will register and name the queue number.
- Ask the customer to wait nearby safely and ask the customer not to return until alerted. Alert the customer in advance to give them time to return for service.
The answer is:
Ask the customer to wait nearby safely and ask the customer not to return until alerted. Alert the customer in advance to give them time to return for service.