You are the new online advertising manager for the Midland Daily Courier, a local newspaper. The newspaper wants to sell banner advertising on its site in a variety of sizes to meet the needs of its advertisers. Examine the IAB Web site and other online resources of your choosing, and then prepare a memo to the newspaper's advertising manager that outlines the current state of standards for banner ads. Include a specific recommendation regarding how many different sizes the newspaper should offer. Limit your memo to 500 words.