You work as an administrator at ABC.com. The ABC.com network consists of a single domain named ABC.com. All servers on the ABC.com network have Windows Server 2012 R2 installed. ABC.com has a server， named ABC-SR07， which has the ADDS， DHCP， and DNS server roles installed. ABC.com also has a server， named ABC-SR08， which has the DHCP， and Remote Access server rolesinstalled. You have configured a server， which has the File and Storage Services server role installed， to automatically acquire an IP address. The server is named ABCSR09.You then create reservation on ABC-SR07， and a filter on ABC-SR08.  Which of the following is a reason for this configuration？（）

• A、It allows ABC-SR09 to acquire a constant IP address from ABC-SR08 only.
• B、It configures ABC-SR09 with a static IP address.
• C、It allows ABC-SR09 to acquire a constant IP address from ABC-SR07 and ABC-SR08.
• D、It allows ABC-SR09 to acquire a constant IP address from ABC-SR07 only.