How do VNX Snapshots differ from VNX Snapview Snapshots?

A.
VNX Snapshots use redirect on first write.
SnapView Snapshots use copy on first write.

B.
VNX Snaphosts use copy on first write.
SnapView Snapshots use redirect on first write.

C.
VNX Snapshots require application I/O be stopped.
SnapView Snapshots do not.

D.
VNX Snapshots support 64 snapshots per LUN.
SnapView Snapshots support 32.