You create a workflow and set the scope to User (default). UserA owns the workflow.
UserB is making bulk changes on records that will trigger the workflow.
Which records will this workflow affect?
A. records owned by users in the same business unit as UserB
B. records owned by UserA
C. records owned by UserB
D. records owned by either UserA or UserB
Answer is: B
https://docs.microsoft.com/en-us/previous-versions/dynamicscrm-2016/administering-dynamics-365/dn531067(v=crm.8)#BKMK_SecurityContext0fWorkflowProcesses
Security context of workflow processes
When a background workflow is configured as an on-demand process and is started by a user using the Run Workflow command, the actions that the workflow can perform are limited to those the user could perform based on the privileges and access levels defined by the security role(s) set for their user account.
When a background workflow starts based on an event the workflow operates in the context of the person who owns it, usually the person who created the workflow.
For real-time workflows you have the Execute As option and you can choose whether the workflow should apply the security context of the owner of the workflow or the user who made changes to the record. If your workflow includes actions which all users would not be able to perform based on security constraints, you should choose to have the workflow run as the owner of the workflow.
Correct is “B”!
B:
User– when this option is selected, the Workflow will exclusively run on records with the same owner as the Workflow.