The tool that Universal Containers should use to prevent teams from overwriting each other's changes in the future is a version control system. A version control system is a tool that tracks and manages changes to code or configuration in a software project or enhancement. A version control system helps to prevent teams from overwriting each other's changes by allowing them to create and work on separate branches or copies of the code or configuration, merge their changes with the main branch or copy when they are ready, and resolve any conflicts or errors that may occur during the merge. A version control system also helps to maintain a history of changes, backup and restore previous versions, and collaborate and communicate with other team members.
References:
https://trailhead.salesforce.com/content/learn/modules/git-and-git-hub-basics/work-with-the-git-hub-workflow

Explanation
DevOps is a set of practices that combines software development and IT operations to deliver software faster and more reliably. DevOps helps business analysts and system admins track the changes they are committing to Salesforce by using tools such as version control, continuous integration, continuous delivery, and testing automation.
References:
https://trailhead.salesforce.com/en/content/learn/modules/salesforce-business-analyst-certification-prep/im
https://www.salesforce.com/products/platform/best-practices/devops/

Explanation
The business analyst should review the version control history to understand which user stories were modified by the project lead. Version control is a system that records changes to a file or set of files over time so that you can recall specific versions later. Version control can help track who made what changes, when, and why.
It can also help compare different versions, merge changes, resolve conflicts, and restore previous versions.
The business analyst should use a version control system to store and manage their user stories in a repository and review the version control history to see the edits made by the project lead. Reviewing the approval history is not a good option because it would only show who approved or rejected the user stories, not who modified them or how. Reviewing the change sets history is not a good option because it would only show what metadata components were deployed or retrieved between orgs, not what user stories were modified or how. References:
https://trailhead.salesforce.com/en/content/learn/modules/org-development-model/get-to-know-org-development

Explanation
The path that the business analyst should take to find information about custom apps, active Salesforce Sites, active flows, custom tabs, and Visualforce pages is to review configuration settings. Configuration settings are options or preferences that can be customized or modified in Setup. They can help the business analyst understand how Salesforce was implemented and what features or components were enabled or disabled.
Custom apps, active Salesforce Sites, active flows, custom tabs, and Visualforce pages are examples of configuration settings that can be accessed or changed in Setup.Conducting stakeholder interviews may be a useful way to gather information about business needs, expectations, or feedback, but not about technical details or configuration settings. Reading business process documentation may be a useful way to understand how a business process works or flows, but not about technical details or configuration settings. References:
https://trailhead.salesforce.com/content/learn/modules/salesforce-business-analyst-certification-prep/customer-di
https://trailhead.salesforce.com/content/learn/modules/salesforce-business-analyst-certification-prep/business-pro

When a business analyst discovers that different teams have different needs or preferences for using Salesforce fields, they should refine the requirements to accommodate both teams. This is because deleting fields that are actively used by another team could cause data loss, errors, or inefficiencies in their processes. The business analyst should work with both teams to understand their use cases, data models, workflows, reports, dashboards, integrations, security settings, etc., and find ways to customize Salesforce fields that meet both teams' needs without compromising data quality or performance. References:
https://trailhead.salesforce.com/content/learn/modules/salesforce-business-analyst-certification-prep/requirement