To solve this question, the user needs to know the definition of "White List" data validation.

Option A is correct. "White List" data validation means that the data is validated against a list of values that are known to be valid. This means that any input that is not on the list of valid values will be rejected or flagged as invalid. It is a way to ensure that only authorized data is accepted.

Option B is incorrect. "Black List" data validation would mean that the data is validated against a list of values that are known to be invalid. In this case, any input that matches a value on the list would be rejected or flagged as invalid.

Option C is incorrect. While both options A and B are described, "White List" data validation refers specifically to option A.

Option D is incorrect. At least one of the options (option A) is correct.

Therefore, the answer is: A. Data is validated against a list of values that are known to be valid.