Which of the following is an example of a Luxury brand of Marriott?

St. Regis is indeed recognized as a luxury brand within the Marriott portfolio. It epitomizes high-end hospitality, offering an exquisite experience characterized by elegant accommodations, refined service, and exceptional attention to detail. Properties under the St. Regis brand often feature luxurious amenities such as fine dining, personalized butler service, and unique design elements that cater to affluent travelers seeking a premium experience.

In contrast, the other options represent different tiers of Marriott's offerings, primarily focusing on more budget-friendly or mid-scale accommodations. For example, Fairfield Inn and Courtyard by Marriott cater to business and leisure travelers who prioritize comfort and functionality without necessarily seeking luxury. Residence Inn is designed for extended stays, appealing to guests who need more home-like amenities but not the exclusivity and opulence associated with luxury brands like St. Regis.