Which command results in a reliable backup of an active SYSUAF.DAT?

Which command results in a reliable backup of an active SYSUAF.DAT?

A.
$ COPY SYSUAF.DAT SYSUAF.SAVE

B.
$ BACKUP/IGNORE=INTERLOCK SYSUAF.DAT SYSUAF.SAVE

C.
$ CONVERT/SHARE SYSUAF.DAT SYSUAF.SAVE

D.
$ BACKUP SYSUAF.DAT SYSUAF.SAVE