You work as a network Exchange administrator at Company.com.The Company.com network currently consists of a single Active Directory forest containing a single domain named Company.com.The Company.com organization makes use of Microsoft Exchange Server 2010 as their messaging solution.Company.com has recently created a distribution group for the network users.During the course of the business week you receive instruction from Company.com to ensure that the newly added users are able to add their mailboxes to the distribution group.What should you do？（）

• A、You should consider having the security settings of the distribution group modified.
• B、You should consider having the authentication settings of the ECP virtual directory modified.
• C、You should consider having the group scope of the distribution group modified.
• D、You should consider having the approval mode of the distribution group modified.