Explanation
The best practice for establishing credibility and conveying empathy with stakeholders during discovery sessions is to ensure the workshop schedule considers time zone and language differences. This shows respect and sensitivity to the stakeholders' preferences and needs, and helps to avoid potential misunderstandings or conflicts. It also helps to build rapport and trust with the stakeholders, and encourages their participation and engagement. The other options are either irrelevant or ineffective. Option A does not address the stakeholders' needs or expectations, and may come across as boastful or arrogant. Option C does not convey empathy or understanding, and may be too repetitive or boring.
References:https://trailhead.salesforce.com/en/content/learn/modules/business-analysis-discovery/plan-and-facili

Explanation
A use case is a type of documentation that describes how a user interacts with a system to achieve a specific goal. It is written from the user's point of view and follows a standard format of "A [user role] wants to [goal] by [steps]". A use case helps to capture the user's needs and expectations from the system and provides a basis for developing test cases and acceptance criteria. A BA should use use cases to document how users will interact with the system and what outcomes they expect from it. References:
https://trailhead.salesforce.com/en/content/learn/modules/business-analysis-functional-requirements/write-use-ca

This answer selects Universal Process Notation (UPN) as the diagramming notation that the BA should use for the process map. UPN is a simple and standardized way of creating process maps, using only four symbols:
activity, decision, start/end, and annotation. UPN can help the BA create a process map that is applicable across all industries, provides context for metrics and management decisions, and supports regulatory considerations. References:
https://trailhead.salesforce.com/en/content/learn/modules/salesforce-business-analyst-quick-look/use-process-ma