Final answer:
Use Copado Static Code Analysis to review the development team's Apex code against best practices, identify errors early, and maintain high-quality code to prevent scalability issues in production.
Step-by-step explanation:
To address scalability issues and ensure that the development team is adhering to best practices for writing Apex classes, the tool you would use is b. Copado Static Code Analysis. This tool automatically reviews the code against predefined rules and best practices, identifying potential problems that could affect performance and maintenance. By integrating static code analysis into your development process, you can detect errors early and prevent them from reaching production, ensuring that your organization maintains high-quality code standards.