Solaris系统中，关于挂接点的命令格式正确的是：（）
A.A：mount /dev/dsk/c0t1d0s7 /export/home1
B.B：mount /export/home1 /dev/dsk/c0t1d0s7
C.C：umount /dev/dsk/c0t1d0s7
D.D：umount /export/home1
正确答案是ACD