A network administrator is planning a network installation for a large organization.The design requires 100 separate subnetworks,so the company has acquired a Class B network address.What subnet mask will provide the 100 subnetworks required, if 500 usable host addresses are required per subnet?（）

• A、255.255.240.0
• B、255.255.248.0
• C、255.255.252.0
• D、255.255.254.0
• E、255.255.255.0
• F、255.255.255.192