MegaCorp is running Smart center R70, some Gateways at R65 and some other Gateways with R60.
Management wants to upgrade to the most comprehensive IPv6 support. What should the
administrator do first?

A.
UpgradeSmart centerto R77 first.

B.
Upgrade R60-Gateways to R65.

C.
Upgrade every unit directly to R77.

D.
Check the Release Notes to verify that every step is supported.