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. 

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