Question: Say an Order table has a CustomerID column that refers to the customer that placed the order. Say you try to set it to 1

Say an Order table has a CustomerID column that refers to the customer that placed the order.
Say you try to set it to 1234, but there is no such customer with that id.
The database refuses to change the Order table.
What is this called?
Group of answer choices
key integration
referential integrity
data regression
foreign indignation

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