单项选择题修改eth0网卡的IP地址为172.18.48.56和子网掩码255.255.255.128的命令:()
A.ifconfigeth0javascript:void(0);172.18.48.56netmask255.255.255.128
B.ifconfig172.18.48.56netmask255.255.255.128
C.ipconfigeth0172.18.48.56netmask255.255.255.128
D.ifconfigup172.18.48.56netmask255.255.255.128