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An architect has been tasked to deliver a higher availability of the current deployed VMware vSAN Stretched Cluster infrastructure. The new design should incorporate three different sites that can run workloads in case of a failure. Which product should the architect add to the design to meet these requirements?

An administrator of “vsan-prod” cluster noticed the witness components of VMs are flagged as absent after a failed attempt to replace the vSAN Witness Host. Which action should the administrator take to resolve this issue?

An architect is working with an All-Flash vSAN configuration and will be using the Flash Caching Devices in vSAN. Which requirement is specifically needed for these devices? 

During a vSAN design workshop, the customer expressed the following requirements: The ESXi hosts will have their disk related hardware changed to become vSAN nodes. The default storage policy will be based on an FTT=2 (Failures to Tolerate). The vSAN Primary level of failures to tolerate (PFTT) will be set to a value of 2. Based on the request, the architect was shown the following information about the current cluster: The number of existing ESXi hosts is 8. vSphere High Availability (HA) Admission control set to 37.5%. How does this information impact the vSAN cluster design?