The business analyst should use the metadata coverage report to determine which changes must be made manually in each environment. The metadata coverage report is a tool that shows which metadata types and components are supported in different development models and tools, such as change sets, Metadata API, Salesforce CLI, etc. The business analyst should use the metadata coverage report to identify which changes can be deployed automatically using declarative change sets and which changes must be made manually using other tools or methods. The object schema builder is not a resource to determine which changes must be made manually in each environment. The object schema builder is a tool that lets you create and modify custom objects and fields using a graphical interface. It does not show which metadata types and components are supported in different development models and tools. The setup audit trail is not a resource to determine which changes must be made manually in each environment. The setup audit trail is a tool that tracks the recent setup changes that you and other admins have made to your org. It does not show which metadata types and components are supported in different development models and tools. References:
https://trailhead.salesforce.com/en/content/learn/modules/application-lifecycle-and-development-models/underst

Explanation
The principle of Agile methodology that this violates is definition of done. Definition of done is a set of criteria that determines when a user story or a sprint is completed and ready for deployment. It typically includes technical, functional, and quality aspects of the user story or sprint, such as code quality, unit testing, documentation, performance, security, and usability. Definition of done helps to ensure that the work meets the expected standards and quality, satisfies the user's needs and expectations, and aligns with the project goals and scope. In this case, the code review process revealed that the Apex code fails to meet Salesforce coding standards, which means that the definition of done was not met or followed. References:
https://trailhead.salesforce.com/en/content/learn/modules/business-analysis-user-stories/define-done

Explanation
The tool that the business analyst should use to help uncover any technical constraints or potential problems in a Salesforce implementation is Salesforce Optimizer. Salesforce Optimizer is a feature that analyzes a Salesforce org and provides recommendations for improving its performance, security, usability, and maintenance. It can help the business analyst identify any issues or risks in a Salesforce implementation such as unused features or components, complex configurations or customizations, low adoption rates or user satisfaction scores, etc.Setup Audit Trail is a tool that monitors and logs changes made by administrators in Setup. It can help the business analyst track who made what changes and when, but not uncover any technical constraints or potential problems in a Salesforce implementation. Reports and Dashboards are tools that display data or metrics in visual formats such as charts or tables.

Users is the User Management term that is best described by this definition: "Record created to identify a new employee that starts accessing Salesforce". Profiles are User Management terms that define what users can do within an organization based on their job function and responsibilities. Roles are User Management terms that control data visibility and reporting hierarchy within an organization based on users' positions. Usernames are User Management terms that identify users when they log in to Salesforce. References:
https://help.salesforce.com/s/articleView?id=sf.users_def.htm&type=5