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The error messageYou cannot add or change a record because a related record is required in table 'Countries'.will be generated by attempting which of the
The error messageYou 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?aA user tries to enter a record in the table Countries that doesn't contain data in the primary key.bA 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.cA user tries to enter a record to the table Countries with the same primary key as another record.dThe user tries to request a joined table using LINQ.
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