The correct answer is: D. None
A One-To-Many relationship that is not enforcing referential integrity, does not display any symbol next to the foreign key field.
A foreign key is a column or group of columns in a table that refers to the primary key of another table. It is used to establish a relationship between two tables.
Referential integrity is a database constraint that ensures that the values in a foreign key column match the values in the primary key column of the referenced table.
If referential integrity is not enforced, then it is possible for a row in the child table to have a foreign key value that does not exist in the parent table. This can lead to data inconsistencies and errors.
Therefore, a One-To-Many relationship that is not enforcing referential integrity, does not display any symbol next to the foreign key field.