Seems to me it is: A and D.
The main reasons for segmentation are:
The ability to group related assets that are a part of (or support) workload operations.
Isolation of resources.
Governance policies set by the organization.
See: https://learn.microsoft.com/en-us/azure/architecture/framework/security/design-network-segmentation
Answer:
to meet governance policies
to isolate the resources
https://learn.microsoft.com/en-us/azure/virtual-network/virtual-network-vnet-plan-design-arm?source=recommendations#virtual-networks
A. to meet governance policies: Some organizations may have governance policies that require certain resources or environments to be isolated from each other for security, compliance, or data protection reasons. Deploying multiple virtual networks allows these policies to be enforced effectively by isolating resources into separate networks.
D. to isolate the resources: By deploying multiple virtual networks, you can isolate different sets of resources from each other. This isolation enhances security by limiting the impact of potential security breaches or failures to specific sets of resources. It also allows for better network performance and resource management by reducing broadcast traffic and network congestion.
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