Complete the table below by specifying one $(1)$ possible response time for acknowledging customers and their enquiries in the described situations:

Situation Possible response times

$($a$)$ Time set by management for staff to acknowledge a customer enquiry about hiring the facilities for a private function.

$($b$)$ Time set by management of a restaurant for greeting guests when they enter the premises.

$($c$)$ Time set by management for answering the telephone at hotel reception.

$($d$)$ Time set by management to respond to a customer$$s email enquiring about room rates.