Question: When applying a unique constraint using custom validation in Excel, what happens if a user tries to input a value that already exists in the

When applying a unique constraint using custom validation in Excel, what happens if a user tries to input a value that already exists in the same columi?
Excel changes the input value to a unique identifier
Excel allows the duplicate value without any warnings
Excel automatically deletes the existing value
Excel prevents any input and displays an error message
 When applying a unique constraint using custom validation in Excel, what

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