Explanation
This answer states that definition of done is where the BA should capture these requirements after writing user stories for developing a solution for managing leads in Sales Cloud at UC: be assigned a level of effort, be demonstrated to the stakeholder, and have documented deployment steps. Definition of done is a set of criteria that defines when a user story or a task is completed and ready for deployment or delivery. Capturing these requirements in the definition of done means that the BA specifies that a user story or a task must meet or pass these criteria in order to be considered done. Capturing these requirements in the definition of done is where the BA should do it after writing user stories because it helps the BA to clarify and communicate the expectations and standards of the user stories or tasks, and to ensure that they are met orpassed.
References:https://trailhead.salesforce.com/en/content/learn/modules/salesforce-business-analyst-quick-look/use

Explanation
This answer selects sprint review as the type of meeting that should be held to review the current build with stakeholders and gather feedback. A sprint review is a meeting that takes place at the end of each sprint in the scrum methodology, where the development team demonstrates the working product increment to the stakeholders and collects their feedback. A sprint review helps to validate the requirements, evaluate the progress, and adjust the priorities for the next sprint.
References:https://trailhead.salesforce.com/en/content/learn/modules/agile-development-with-scrum/perform-a-s

Explanation
A business analyst assigned to a Service Cloud project should understand the current business processes and document the existing functionality of the customer service department. This will help them identify the gaps, pain points, and opportunities for improvement. Working with Salesforce to purchase the necessary licenses is a task for the project manager or sponsor. Managing existing Salesforce applications and activities is a task for the administrator or developer. References:
https://trailhead.salesforce.com/content/learn/modules/salesforce-business-analyst-certification-prep/customer-di

A gap analysis is a document that compares the current state with the desired future state of a process or system, identifies what needs to change or improve, and recommends actions or solutions to bridge the gap. A gap analysis can help CK understand how to enhance its user experience for customer service agents on Service Cloud so they can effectively meet their service-level agreements. A change management document is a document that outlines how changes will be planned, implemented, communicated, monitored, controlled, etc., during a project lifecycle