You are administering Veritas Volume Manager on the UNIX platform, and you need to remove the volume using vxassist command. Given the following steps:
1. Remove the volume entry from the /etc/vfstab file.
2. Remove all references to the volume by application programs.
3. Stop all Activity by VxVM on the volume using vxvol stop command.
4. Unmount the volume, which is mounted as a file system.
What are the necessary sequential steps you need to follow before removing the volume?
A. 4,2,1,3
B. 3,1,4,2
C. 1,4,3,2
D. 2,4,3,1