What are two uses for External IDs? (Choose two.)

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What are two uses for External IDs? (Choose two.)
A . To create relationships between records imported from an external system.
B . To create a record in a development environment with the same Salesforce ID as in another environment
C . To identify the sObject type in Salesforce
D . To prevent an import from creating duplicate records using Upsert

Answer: A,D