The Food and Beverages department is a key revenue driver for hotels, encompassing income from restaurants, bars, room service, and catering.
- Laundry, a support service, generates minimal revenue in contrast to food and beverage operations.
- Security, while vital for guest and property safety, does not directly contribute to hotel revenue.
- Marketing aids revenue generation through promotion and guest acquisition but is not a direct income source.
Therefore, Food and Beverages is the correct answer.