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

The correct answers are B. Each object can have up to 25 custom external ID fields and D. An external ID field can be an auto-number field.

Salesforce documentation states that each object can have up to 25 custom external ID fields. It also confirms that supported external ID field types include custom auto-number, email, number, and text fields.

A is incorrect because the limit is per object, not per org.

C is incorrect because a URL field is not one of the supported external ID field types.

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