What is the minimum configuration for a vSAN Stretched Cluster?

Match each VxRail API request with the information to be retrieved.

For which typical activity would the Full data migration setting be used when placing a VxRail host into maintenance mode?

A customer requires a Stretched VxRail Cluster with S570 nodes in its minimal configuration.
Which setup will fulfill the requirement?

An implementation engineer is attempting to add a new node to a 3 node VxRail cluster.
What is the minimum VxRail code version that no longer requires the fourth node to match the first three nodes?