Among two records related by master – detail relationship, the detail record can have an owner which is different from the owner of the master record.
Can a single permission set be assigned to users of different profiles?
If any workflow rule is having a task of send email in which a particular user is a recipient of that email, then that user can be deactivated only if the workflow rule is deactivated.
If at the profile level, 'Password Never Expires' has been checked but at Setup > Security Controls > Password Policies if it is specified that password expires in 30 days, then which of the two would be true for users of that profile?