Your company is developing a new website that will be accessed by many user roles,...

Comprehensive and Detailed In-Depth Explanation:

Component Testing (C) focuses on individual components or units and does not address usability or role-based testing.

System Testing (D) is the first level where the complete and integrated system is tested as a whole. It includes testing non-functional requirements such as usability, accessibility, and suitability for different user roles.

User Acceptance Testing (A) and Beta Acceptance Testing (B) are done later and focus on validating the product according to user needs and real-world scenarios.

Since testing for role appropriateness and usability should start as early as possible in the testing lifecycle, the correct answer is D (During system testing).