A number of U.S.-based retail chains have begun using check-out terminals that do not use clerks.This is an example of what level of service?

Name: A number of U.S.-based retail chains have begun using check-out terminals that do not use clerks.This is an example of what level of service?
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The use of check-out terminals that do not use clerks is an example of self-service. This means customers are responsible for completing their own transactions without the assistance of an employee.

A Number of U