What are two recommended reasons for configuring a cluster with a least one node in addition to the minimum required number?

What are two recommended reasons for configuring a cluster with a least one node in addition to the minimum required number? (Choose two.)
A. To ensure object accessibility
B. To support the use of RAID-6
C. To provide more flexible storage policy options
D. To provide full protection during maintenance mode operations
E. To support data at rest encryption on vSAN hybrid clusters