An online apparel retailer runs regular marketing campaigns on social media channels. The retailer is considering four social media marketing campaignson Facebook, Instagram, Pinterest, and Twitterfor four weeks prior to the holiday season. However, due to its limited marketing budget, the retailer cannot run all four campaigns. The accompanying table describes the weekly cost (in $1,000) and the expected numbers of consumers each campaign will reach (in 1,000).

a. Formulate and solve the IP model to determine which of the four marketing campaigns the retailer should run in order to maximize the number of consumers reached, without going over its budget. What is the maximum number of consumers that the retailer can reach? b. Which social media channels should the retailer use in order to maximize the number of consumers reached? c. Will the retailer use up all of its marketing budget each week? d-1. If the company wants to run the marketing campaigns on no more than two social media channels, which social media platforms should the retailer use for the marketing campaigns in order to maximize the number of consumers reached? d-2. What is the maximum number of consumers that the retailer can reach