How many Roll Up summary fields can be created in the enterprise Edition on a Custom Object?

Workflow Tasks are NOT tracked in the Activity History and can be reported on MMM?

Joe is attempting to import an invalid value into a picklist field. The import wizard will respond with an error message.

Northern Trail Outfitters has the Case Object set to private. The support manager raised a concern the reps have a boarder view of data than expected and can see all cases on their groups dashboards.
What could be Causing reps to have inappropriate access to data on dashboards?

The System Administrator has been asked to ensure an email goes out to Sales Ops when an opportunity is closed notifying them of the closed deal. What evaluation criteria will the system admin use for the workflow rule?