单项选择题
在Windows中运行______命令后得到如图9-15所示的结果。如果要将目标地址为102.217.112.0/24的分组经102.217.115.1发出，需增加一条路由，正确的命令为______。
A．route add 102.217.112.0 mask 255.255.255.0 102.217.115.1
B．route add 102.217.112.0 255.255.255.0 102.217.115.1
C．add route 102.217.1 12.0 255.255.255.0 102.217.115.1
D．add route 102.217.112.0 mask 255.255.255.0 102.217.115.1
B．route add 102.217.112.0 255.255.255.0 102.217.115.1
C．add route 102.217.1 12.0 255.255.255.0 102.217.115.1
D．add route 102.217.112.0 mask 255.255.255.0 102.217.115.1