A Minimal Effort Upgrade of a cluster:
A.
Is only supported in major releases (R70 to R71, R71 to R77).
B.
Requires breaking the cluster and upgrading members independently.
C.
Treats each individual cluster member as an individual gateway.
D.
Upgrades all cluster members except one at the same time.
C
B and C would be correct but based on the pure definition of this in the sk107042, C is correct.
=> Minimal Effort:
Description:
Each cluster member is upgraded as an independent Security Gateway.
Existing connections are disrupted.
C. Treats each individual cluster member as an individual gateway.