Utilize the input text as a context reference, choose the right relationship between 'Amazon Prime' and 'Amazon' from the options.
Options: owned by, brand, chief executive officer, stock exchange

The world’s largest bricks-and-mortar retailer has taken aim at e-commerce giant Amazon.com Inc. recently, by rolling out an unlimited shipping service for $50 a year , which is about half what Amazon charges for its Amazon Prime service.
owned by