Ursa Major Solar has its business hours set from 9:00 AM to 5:00 PM for the reps that are on pacific time. The reps on Eastern Time need business hours set to start 3 hours earlier to cover for support.
How should an administrator solve for this issue?

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You can create email alerts for workflow rules on activities.

Which statements are true about standard fields?

How many External ID fields can you have per object?
External ID: When importing custom objects, solutions, or person accounts, you can use external IDs to prevent duplicate records from being created as a result of the import operation.