of the following best describes rebating?

$$ A$)$ An agent sends an existing client a season's greetings card.

$$ B$)$ An agent offers a client Super Bowl tickets in exchange for purchasing a life insurance policy.

$$ C$)$ An agent gives all prospects and new clients an inexpensive desk calendar and a pen with the agency's contact information on them.

O D$)$ An agent offers to take a long$-$time client out to lunch on the clients birthday.

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I