Answer:
A restaurant waiter is a job that falls under the tertiary economic sector.
Step-by-step explanation:
There are four economic sectors, all of which have their unique characteristics. Each of the economic sectors is related to a certain type of economy and with the level of development of a country. The four economic sectors are the primary, secondary, tertiary, and quaternary ones.
The job in question, a restaurant waiter, is a job that provides a service. Every job that provides a service/s is part of the tertiary economic sector, thus a restaurant waiter is part of this sector too. The tertiary sector tends to be dominant in countries that are at a high level of development, or countries that have the majority of their income from tourism.