The Error Message You Cannot Add or Change a Record

Multiple Choice

The error message You cannot add or change a record because a related record is required in table 'Countries'. will be generated by attempting which of the following with the Megacities database?

A) A user tries to enter a record in the table Countries that doesn't contain data in the primary key.
B) A user tries to add a record to a table that is related to the Countries table, and that record contains a foreign key value that does not correspond to a primary key value in the Countries table.
C) A user tries to enter a record to the table Countries with the same primary key as another record.
D) The user tries to request a joined table using LINQ.