A). Scaling the Network Firewall instance up or down: Scaling the firewall instance typically only affects its performance capacity, not the actual rules controlling traffic flow.B. Modifying the Network Firewall,s resource tags: Resource tags are primarily for organizing and identifying resources, and updating them doesn,t impact firewall rules.C. Adding a new subnet to the VCN protected by the firewall: When you add a new subnet, traffic to and from that subnet isn,t automatically subject to the existing firewall rules. You need to create new rules explicitly allowing or denying traffic to/from the new subnet, ensuring it aligns with your security policies.D. Configuring a new security list for a subnet within the VCN: Security lists operate at the subnet level, controlling traffic entering and leaving that specific subnet. While they interact with the overall network security strategy, changes to a subnet,s security list don,t directly necessitate modifications to the Network Firewall rules themselves.