The best practice that the BA should follow is to schedule additional discovery sessions with the sales users to understand what will be impacted by the changes. Discovery sessions are meetings or workshops where the BA elicits, clarifies, and validates the needs, expectations, pain points, goals, and priorities of the stakeholders for a project. Discovery sessions help to gather more information and feedback from the stakeholders, understand their perspectives and preferences, identify the gaps and opportunities in their current process, and demonstrate the value and benefits of the proposed solution. By scheduling additional discovery sessions with the sales users, the BA can better understand their challenges and requirements, and document a comprehensive list of the components that will be affected by the updated flow. References: https://trailhead.
salesforce.com/en/content/learn/modules/business-analysis-discovery/plan-and-facilitate-discovery-sessions

Explanation
A functional requirements specification is a document that describes the software and behavioral requirements of an application, such as what features it should have and how it should behave under different scenarios. It can help communicate the expectations and needs of the stakeholders to the development team. A scope statement specification is a document that defines the project scope, objectives, deliverables, assumptions, constraints, and exclusions. It does not describe the software and behavioral requirements of an application. A system requirements specification is a document that describes the technical requirements of an application, such as hardware, software, security, performance, and reliability. It does not describe the software and behavioral requirements of an application. References: 1
https://trailhead.salesforce.com/en/content/learn/modules/salesforce-business-analyst-certification-prep/requirem

Explanation
A sprint review is a meeting that should be held by the scrum team working on Salesforce projects at Northern Trail Outfitters to review the current build with stakeholders and gather feedback. A sprint review is an event that occurs at the end of each sprint, where the scrum team demonstrates the work done during the sprint and invites feedback from stakeholders. A retrospective is a meeting that occurs after each sprint, where the scrum team reflects on what went well and what can be improved in the next sprint. A daily stand-up is a meeting that occurs every day during a sprint, where the scrum team members share their progress, plans, and impediments. References:
https://trailhead.salesforce.com/content/learn/modules/salesforce-business-analyst-certification-prep/user-accepta
https://trailhead.salesforce.com/content/learn/modules/agile-development-with-scrum

This answer states that reviewing the services team's goals, initiatives, strategies, and obstacles is what the BA should do to determine if the current solution of implementing an Experience Site that allows customers to view Knowledge articles and submit cases is adding value to UC's business. Goals are what the services team wants to achieve or accomplish in terms of business outcomes or benefits. Initiatives are what the services team plans to do or implement to achieve their goals. Strategies are how the services team executes or delivers their initiatives. Obstacles are what prevents or hinders the services team from achieving their goals, implementing their initiatives, or executing their strategies. Reviewing the services team's goals, initiatives, strategies, and obstacles means that the BA analyzes and documents these elements related to implementing an Experience Site that allows customers to view Knowledge articles and submit cases. Reviewing the services team's goals, initiatives, strategies, and obstacles is what the BA should do to determine if the current solution is adding value to UC's business because it helps the BA to measure and evaluate the performance and impact of the current solution against these elements. References:
https://trailhead.salesforce.com/en/content/learn/modules/salesforce-business-analyst-quick-look/use-stakeholder