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How do you add a foreign key to an existing table created by another module?

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How do you add a foreign key to an existing table created by another module?

A.

Create etc/db_schema.xml file with the table node and constraint child node

B.

Run the command bin/magento setup:db-schema:upgrade

C.

This can only be done with raw SQL in a Schema Patch file

D.

Create the etc/db_constraints.xml file and specify foreign key there in the constraint node

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