Which salesforce org has a complete duplicate copy of the production org including data and configuration?

Which Apex collection is used to ensure that all values are unique?

Refer to the following code that runs in an Execute Anonymous block:

In an environment where the full result set is returned, what is a possible outcome of this code?

A developer created a visualforce page using a custom controller that calls an apex helper class. A method in the helper class hits a governor limit. what is the result of the transaction?

Universal Container uses Service Cloud with a custom field, stage_c, on the Case object.
Management wants to send a follow-up email reminder 6 hours after the stage_c field is set to '';Waiting on customer'' The .... Administrator wants to ensure the solution used is bulk safe.
Which two automation tools should a developer recommend to meet these business requirements?
Choose 2 answers