1. In each of the following situations, identify the customer and the server:
(a) Planes arriving at an airport.
(b) Taxi stand serving waiting passengers.
(c) Tools checked out from a crib in a machining shop.
(d) Letters processed in a post office.
a) customer - plane , server - airport
b) customer - passenger, server - taxi
c) customer - tool, server - machining shop
d) customer - letter, server - post office
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