A marketer is setting up an SMS campaign to send promotional offers. According to the Telephone Consumer Protection Act (TCPA), what is the MOST critical requirement before sending the first message?
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A
The user must have made a purchase in the last 18 months.
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B
The user's phone number must not be on the National Do Not Call Registry.
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C
The business must obtain prior express written consent from the user.
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D
The user must have an active account with the business.