You are migrating a database named Orders to a new server that runs Microsoft SQL Server 2012. You attempt to add a SQL login, [User1], to the database. However, you receive the following error message:
"User already exists in current database."
You need to configure the [User1] login to be able to access the Orders database and retain the original permissions. You need to achieve this goal by using the minimum required permissions. Which Transact-SQL statement should you use?
A. DROP USER [User1];
CREATE USER [User1] FOR LOGIN [User1];
ALTER ROLE [db_owner] ADD MEMBER [User1];
B. ALTER ROLE [db_owner] ADD MEMBER [User1];
C. ALTER USER [User1] WITH LOGIN [User1];
D. ALTER SERVER ROLE [sysadmin] ADD MEMBER [User1];
