What is the primary benefit of using upgrade export over either backup or snapshot?

What is the primary benefit of using upgrade export over either backup or snapshot?
A . The commands backup and snapshot can take a long time to run whereas upgrade export will take a much shorter amount of time.
B . upgrade export will back up routing tables, hosts files, and manual ARP configurations, where backup and snapshot will not.
C . upgrade export has an option to backup the system and Smart View Tracker logs while backup and snapshot will not.
D . upgrade export is operating system independent and can be used when backup or snapshot is not available.

Answer: D