Final answer:
The automatic creation and update rule feature allows the creation of case records automatically. The available source record types for automatically creating a case are mailbox alert, auto post, and booking alert.
Step-by-step explanation:
The source record types available for automatically creating a case using the automatic creation and update rule feature are:
- Mailbox alert: This allows cases to be created automatically when an alert from a mailbox is received.
- Auto post: This enables cases to be automatically generated when a post is made.
- Booking alert: This type allows cases to be created automatically based on a booking alert.
However, the source record types mentioned in options A (social activity), C (survey activity), and D (auto post) are not correct and should not be selected.