You need to ensure&#

You need to ensure that the Cust_CalcData column is implemented appropriately. What should you do?（）

• ASpecify that the Cust_CalcData column must be implemented as a computed column of the table. 
• BSpecify that the Cust_CalcData column must be indexed using a non-clustered index.
• CSpecify that the Cust_CalcData column must be implemented as a column that uses a user-defined data type.
• DSpecify that the Cust_CalcData column must be updated by a SQL Server Agent job that runs nightly.