Preinstallation planning requires collecting network and management information necessary for initial configuration. For a switchless cluster, cluster switch information is not applicable.

Required data includesmanagement IP addressesfor cluster and node management access,gateway IP addressesfor external connectivity, andBMC IP addressesfor out-of-band hardware management.

Cluster names are typically assigned during setup but are not strictly required as preinstallation inputs from the customer.

Therefore, the correct answers areA, C, and D.