During an HACMP migration，two nodes of a four-node cluster have been migrated. The existing hardware of the remaining two nodes do not meet the pre-requisites of the HACMP level that is being installed.  Which of the following is the best method for resolving this issue？（）

• A、 Upgrade the unsupported hardware and continue with the migration.
• B、 Restore the two nodes that have been migrated with a cluster snapshot.
• C、 Restore the two nodes that have not been migrated with a cluster snapshot.
• D、 Synchronize the cluster to allow the nodes that didn’t migrate to join the cluster.