问题：

[单选] You need to design a configuration for Exchange Server storage that meets the business and technical requirements. What should you do？（）

A . Create a single storage group. Create one database for all users
B . Create two storage groups. In each storage group， create one database. Place mailboxes for remote users in one storage group database， and place all other mailboxes in the other storage group database
C . Create two storage groups. In each storage group， create one database. Place executive mailboxes in one storage group database， and place all other mailboxes in the other storage group database
D . Create two storage groups. In one storage group， create a database， and place all mailboxes for remote users and executives in the database. In the other storage group， create a database for all other mailboxe