Which two details should the app builder know when using external ID fields?

DreamHouse Realty wa nts to import its property records from an external system into Salesforce.

The app builder will use an external ID field to house the property ID from the external system.

Which two details should the app builder know when using external ID fields? Choose 2 answers
A . An external ID field can be a number field.
B . An external ID field can be a URL field.
C . An external ID field can be a phone field.
D . An external IDfield can be a text field.

Answer: A, D

Explanation:

An external ID field can be a number field or a text field, but not a URL field or a phone field. A URL field is used to store web addresses and a phone field is used to store phone numbers. An external ID field is used to store unique identifiers from an external system and it can be used for upsert operations