Answer: Configure a /28 primary IP address range for the node IP addresses. Configure a /24 secondary IP range for the Pads. Configure a /22 secondary IP range for the Services.

To optimally design the IP schema for the GKE cluster, considering the initial deployment of 5 nodes with potential to scale to 10 nodes, a maximum of 8 Pods per node, and services growing from 100 to up to 1024, the following IP ranges are recommended: 1. **Node IP Range**: A /28 provides 16 IP addresses, which is sufficient for scaling from 5 to 10 nodes. 2. **Pod IP Range**: Each node requires a block of IPs based on the maximum number of Pods per node. With 8 Pods per node, each node needs 16 IPs (the next power of two). For 10 nodes, 10 * 16 = 160 IPs are needed. A /24 (256 IPs) is the minimal range that meets this requirement. 3. **Service IP Range**: A /22 provides 1024 IPs, which matches the maximum requirement of 1024 services. Option D correctly uses a /28 for nodes, a /24 for Pods, and a /22 for Services, satisfying all requirements optimally.

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