Correct Answer: A, C, ETo prepare for the installation of a new 2-node switchless AFF A250 ONTAP 9.8 cluster, the required information from the customer includes management IP addresses, the gateway IP address, and the cluster name. The management IP addresses are necessary for network access and configuration. The gateway IP address ensures proper routing and connectivity to external networks. The cluster name is required for identifying and administrating the cluster. Cluster switch name is not applicable as it is a switchless cluster, and BMC IP addresses are not crucial for basic cluster setup and operation.