Which two factors would lead the Architect to pick a multi-author instance architecture setup?

An Architect is performing infrastructure and capacity planning for Author servers for a customer using AEM 6.5 .

Which two factors would lead the Architect to pick a multi-author instance architecture setup? (Choose two.)
A . Website Traffic handled by servers
B . Fail safeness of the servers
C . Number of Parallel Authors
D . Cache Efficiency on the dispatcher
E . Types of actions performed by Authors

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Answer: B,D