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.