You administer a SQL Server 2008 instance. You plan to design the security requirements for a new database application that will be deployed to the instance.  The new database contains a table that is created by using the following code segment: You need to ensure that the BonusPlan column is protected from unauthorized access by using the most secure method. What should you do?（）

• A、Use Transparent data encryption. 
• B、Use the Trustworthy option for the database. 
• C、Use the Advanced Encryption Standard encryption on all columns in the database. 
• D、Use the NTFS file system security and limit the access of the database files to the SQL Server 2008 Service account.