What type of NTP/time sources are recommended for Nutanix clusters?

What is true when adding a storage-only node to the cluster?

An administrator is conducting updates in a Nutanix cluster and is being prompted for handling non-migratable VMs.
Which VM type is non-migratable?

What is the benefit of configuring user-defined Alert Policies in Prism Central?

A custom alert policy is configured for a VM named Calm_3_8_VM to generate aWarningalert ifmemory usageexceeds90%or is below30%for10 minutes.
What action can be taken to prevent this alert policy from creating multiple alerts within a 48-hour period if the 90% threshold is crossed multiple times?