Which medium offers a retailer the greatest control in reaching a targeted geographic area?

Question

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Direct mail allows a retailer to control the targeting of a specific geographic area based on the mailing list used. The retailer can also control the creative content and timing of the mail piece, making it a highly targeted and customizable option. The other mediums listed may have some level of targeting ability, but not as much control as direct mail.

Which Medium Offers a Retailer the Greatest Control in Reaching