Explanation
Another important item that the BA should look for in the UAT plan is timelines. Timelines are schedules that specify when each testing activity or task should start and end, and who is responsible for completing them.
Timelines help to ensure that testing is conducted in an efficient and timely manner, avoid delays or conflicts in testing resources or availability, and meet the project deadlines and expectations. The other options are either irrelevant or incomplete. Option A does not relate to the UAT plan, but rather to the project budget or scope. Option C does not specify what process maps are needed or how they are used in testing.
References:https://trailhead.salesforce.com/en/content/learn/modules/business-analysis-testing/plan-user-accepta

Explanation
This answer explains that an activity box marked "C Customer" means that the customer should be consulted.
In a process map that uses Universal Process Notation (UPN), an activity box is a symbol that represents a task or an action that is performed in a business process. An activitybox can be marked with a letter to indicate the role or the resource that is responsible for performing the task or action. The letter C stands for consult, which means that the resource should be asked for input or advice before or during the task or action.
References:https://trailhead.salesforce.com/en/content/learn/modules/salesforce-business-analyst-quick-look/use

An Admin can unlock a user from Users > Select user > Unlock. This is the standard way to unlock a user who has been locked out due to incorrect password attempts or other reasons. Setup > Locked Users > Unlock, Setup > Object Manager > Users > Select User > Unlock, and Users > Logins > Unlock Users are not valid ways to unlock a user in Salesforce. References: https://help.salesforce.com/s/articleView?id=sf.
users_unlock.htm&type=5