today, $\_\_\_\_\_\_\_\_$ is an important symbol of$$ respect, and in most business$$ settings, it is the proper greeting.

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Part $1$

A$.$

addressing someone by his or her first name or nickname

B$.$

addressing someone as$"$Mr$.",$ Mrs$.",$ or$"$Ms$."$

C$.$

the handshake

D$.$

addressing someone by his or her formal name

E$.$

giving a hug