you need to validate a vendor id entered by user the..., Input Validation, ASP.NET

Question:You need to validate a vendor ID entered by a user. The valid vendor IDs exist in a
database table. How can you validate this input?

A Provide a RegularExpressionValidator control and set the ValidationExpression
property to /DbLookup{code}. 
B Provide a RangeValidator control, and set the MinValue property to
DbLookup(code) and the MaxVaue property to DbLookup(code). 
C Provide a CustomValidator control with server-side code to search the database
for the code. 
D Provide a CompareValidator control and set the compare expression to the name
of a server-side function that performs a database lookup of the code.

+ AnswerC

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Question:You need to validate a vendor ID entered by a user. The valid vendor IDs exist in a database table. How can you validate this input?

A Provide a RegularExpressionValidator control and set the ValidationExpression property to /DbLookup{code}.

B Provide a RangeValidator control, and set the MinValue property to DbLookup(code) and the MaxVaue property to DbLookup(code).

C Provide a CustomValidator control with server-side code to search the database for the code.

D Provide a CompareValidator control and set the compare expression to the name of a server-side function that performs a database lookup of the code.

C