For a highly available Cloud Pak for Business Automation deployment, the priority is to deploy control planes and worker nodes across multiple availability zones. This design reduces single-zone failure risk and enables the OpenShift platform to reschedule workloads, maintain quorum, and recover services when infrastructure in one zone becomes unavailable. Keeping hardware in one availability zone improves locality but creates a fault-domain concentration risk, so option A is the opposite of the recommended HA posture. IBM HTTP Server is relevant to traditional WebSphere-based topologies, not the primary load-balancing mechanism for Cloud Pak container deployments. Node agents are also associated with traditional WebSphere Network Deployment rather than Kubernetes-native pod supervision. In containerized CP4BA, high availability is achieved through pod distribution, resilient storage, OpenShift scheduling, router/load-balancer behavior, replicas, and fault-domain separation. A correct architecture separates failure domains across control-plane and worker infrastructure. References/topics: High availability topology, Red Hat OpenShift fault domains, Storage HA, CP4BA HA versus traditional on-premises HA.