To minimize inter-zonal egress costs, Google recommends creating separate packet mirroring policies for each zone and using a regional managed instance group (MIG) for collectors. This ensures mirrored traffic stays within the same zone. Option A correctly creates three zonal policies (one per zone) to scope traffic to instances in their respective zones using instance tags. The regional collector group (MIG) with instances in all zones ensures traffic is processed within the same zone, avoiding cross-zone costs. Option B uses a single regional policy, which might inadvertently include unintended instances across zones and risks cross-zone traffic if the collector group lacks instances in all zones. Option C creates redundant zonal collector groups, adding unnecessary management overhead, whereas a regional MIG is more efficient. Option D uses subnets instead of instance tags, which does not align with the question's requirement to match traffic via instance tags. Thus, Option A follows Google-recommended practices by combining zonal policies with a regional collector group to minimize costs.