How Do You Add a Foreign Key to an Existing

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 Create etc/db_schema.xml file with the table node and constraint child node
B) Run the command bin/magento setup:db-schema:upgrade <table> <constraint declaration> Run the command bin/magento setup:db-schema:upgrade <table> <constraint declaration>
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 Create the etc/db_constraints.xml file and specify foreign key there in the constraint node