单项选择题

A.ifconfigeth0172.18.48.65netmask255.255.255.128
B.ifconfig172.18.48.65netmask255.255.255.128
C.ipconfigeth0172.18.48.65netmask255.255.255.128
D.ifconfigup172.18.48.65netmask255.255.255.128