The AWS Well-Architected Framework promotes best practices for cloud architecture, and one of its key principles is to 'Loosely couple components' (Option A), which encourages the creation of independent, interchangeable parts that can be developed, deployed, and scaled independently. This leads to a more resilient, maintainable, and adaptable system. Option B, 'Build monolithic systems,' is not a principle of the AWS Well-Architected Framework. Monolithic systems are typically more difficult to scale and maintain, and they are less adaptable to change. Options C and D are not specific architectural design principles of the framework, but they represent general practices that can be considered in the context of cloud architecture. The correct answer is B, as it is the option that does not align with the architectural design principles promoted by the AWS Well-Architected Framework.