问题：

[单选]

You are responsible for managing a SQL Server 2005 database that stores sales information. Many values in nchar columns in the database tables contain preceding or trailing spaces. You need to implement a mechanism that selects the data from the tables without leading and trailing spaces. Your solution must be available for reuse in Transact-SQL statements and views.
What should you do？（）

A . Create DML triggers that query the inserted and deleted tables.
B . Create a stored procedure that calls the LTRIM and RTRIM built-in functions.
C . Create a Transact-SQL function that calls the LTRIM and RTRIM built-in functions.
D . Call the TRIM built-in function.