29. Brad Carlton operates Carlton Collectibles, a rare-coin shop in Washington, D.C., that ships coins to collectors in all 50 states. Carlton also provides appraisal services upon request. During the last several years the appraisal work has been done either in the D.C. shop or at the homes of private collectors in Maryland and Virginia. Determine the jurisdictions in which Carlton Collectibles has sales tax nexus, assuming these states have enacted Wayfair legislation.