You must deploy a new Azure Firewall policy that contains mandatory rules to apply across all existing Azure Firewall deployments by configuring it as a parent policy. Given the current set of firewall policies in your environment (as shown in an accompanying table), what is the minimum number of additional Azure Firewall policies you need to create?

Azure Firewall policies support hierarchical inheritance. A parent policy can define mandatory rules that child policies inherit and can further refine. The problem states you need to apply a new parent policy across all existing Azure Firewall deployments. To achieve this, you must create a new top-level parent policy. Then, each existing policy that does not already have a parent must be updated to reference this new top-level policy, or a new intermediate policy must be created to link them. If the existing policies are not already structured under a common parent, you will need to create at least one new policy to serve as the immediate parent for each distinct branch of your existing policy hierarchy, plus the new top-level policy. Assuming your existing policies are distinct and not already inheriting from a single common parent, you would need the new top-level policy and two additional policies to act as immediate parents for the two existing policies, totaling three new policies.