Option C and E are the correct requirements when planning a Cisco HyperFlex All Flash standard cluster installation using three HX240c M5 servers. Option C states that if the Jumbo MTU option in the HyperFlex installer is enabled, then jumbo frames must also be enabled on the upstream switches, which is true for optimal performance and compatibility. Option E states that the servers must be discovered, unassociated, and connected to each fabric interconnect, which is also true for the cluster installation process. The other options are either false or not applicable for the scenario. References:
* Cisco HyperFlex Systems Installation Guide for Cisco Intersight, Release 4.0 - Cisco HyperFlex Cluster Installation with Cisco Intersight [Cisco HyperFlex HX Data Platform], Cisco HyperFlex Cluster Installation with Cisco Intersight, Before You Begin
* Cisco HyperFlex Systems Installation Guide for Cisco Intersight, Release 4.0 - Cisco HyperFlex Cluster Installation with Cisco Intersight [Cisco HyperFlex HX Data Platform], Cisco HyperFlex Cluster Installation with Cisco Intersight, Install a Cisco HyperFlex Cluster
https://www.cisco.com/c/en/us/td/docs/hyperconverged_systems/HyperFlex_HX_DataPlatformSoftware/ AdminGuide/3_5/ b_HyperFlexSystems_AdministrationGuide_3_5/b_HyperFlexSystems_AdministrationGuide_3_5_chapter_0111