问题：

[单选]

You work as a network 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.The network as a server named ABC_SR05 that provides DHCP services.  You need to create a new IPv4 subnet on the network. The subnet must support a maximum of 5，000 hosts and must have a few unused addresses as possible. 
How would you configure DHCP to support this subnet？（）

A . You should use a subnet mask of 255.255.255.0.
B . You should use a subnet mask of 255.255.248.0
C . You should use a subnet mask of 255.255.240.0.
D . You should use a subnet mask of 255.255.224.0
E . You should use a subnet mask of 255.255.128.0
F . You should use a subnet mask of 255.255.0.0