- Answer: A
As the question states, the user is not an administrator but should be able to preview results. The role they're missing is Preview. This can be assigned by adding them to a new or existing group that has been granted that role.
More information: https://docs.microsoft.com/en-us/office365/securitycompliance/assign-ediscovery-permissions.
- Answer: A
Yes, a guided or new search would accomplish this requirement. You can use either of these (they differ only in user experience) to return content that matches certain criteria, including recipients, keywords, and dates that have been created.
More information: https://docs.microsoft.com/en-us/office365/securitycompliance/content-search.