In a multi-cultural, multi-cultural society, a good strategy for proper customer service would be 1) appear to listen and have a standardized presentation
2) to be polite and get to a first name basis as quickly as possible
3) to get to a first name basis and informality as quickly as possible to put the customer at ease
4) to be polite and begin formally

The best option is D)

Explanation:

Cross-cultural communication can be a thing. As an ardent customer care personnel, one of the best ways to deal with a customer from another culture would be to be polite and to begin formally.

To relate with converse with customers on a first-name basis may be risky. This may be considered rude or insensitive in some cultures.

The safest thing to do is to be polite and formal from the onset.  

Great emotional intelligence and learning about other cultures as much as possible would help a newbie become ardent at dealing with multi-cultural clients.

Cheers!

yes, they are. i think.