HBO used a challenging initial contact with coded mailers.That some people decoded the messages functioned as a type of what to marketers?

Name: HBO used a challenging initial contact with coded mailers.That some people decoded the messages functioned as a type of what to marketers?
Brand: Quizplus
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Question

Quizplus · Accepted Answer

This is feedback because the decoding of the message gives marketers an idea of who is interested in the promotion and the show.

HBO Used a Challenging Initial Contact with Coded Mailers