单项选择题 You work in a company which uses SQL Server 2008. You are the administrator of the company database. Now you are in charge of a SQL Server 2008 instance. There is a database named DB1 in the instance. VIP customer data of the company are stored in DB1. The customers access their profile data by using a Web application. You must ensure the security of the customer data， that is to say， even if the backup media is lost， you must guarantee that data files， log files and subsequent backups and so on are as safe as possible.  So what action should you perform to achieve this goal？（）

单项选择题 You work in a company which uses SQL Server 2008. You are the administrator of the company database. Now you are in charge of two SQL Server 2008 instance. The two instances are respectively named InstanceA and InstanceB. There is a database named Dworks on InstanceA. You move the Dworks database to InstanceB. A user use a SQL Server login named Mary to access the database on InstanceA with the password "Tk@87#34". On InstanceB, you create the same SQL Server login. The user tries to use the SQL Server login Mark to access the Dworks database on InstanceB. But the user gets an error message, according to the indication of the message, the access to the Dworks database has been denied. You must make sure that the user can access the Dworks database on InstanceB successfully.  So on InstanceB, which Transact-SQL statements should you execute?（）

单项选择题 You work in a company which uses SQL Server 2008. You are the administrator of the company database. Now you are in charge of a SQL Server 2008 instance. There is a database named DB1 in the instance. In the Services schema， There is a table named Service.Table. The Services.Table has to be moved from the Sales schema to a new schema named Costs. In the options below， which Transact-SQL statement should you execute？（）