Which of the following is a best practice for policy layers?

The correct answer is D. Sharing layers with other policy packages is a best practice when the same set of controls should be reused consistently across multiple policies. Shared layers reduce duplication, support common policy modules, and make governance easier because updates to a shared layer can be maintained centrally. Option A is the opposite of the intended best practice where reuse is appropriate. Option B is too restrictive; one of the benefits of the Check Point layered policy model is the ability to separate network, application, content, or identity logic into manageable layers. Option C is wrong because implicit cleanup behavior exists as part of layer processing; administrators should add explicit cleanup rules for visibility, not try to disable the implicit mechanism. The proper design is modular but controlled: use shared layers where consistency is needed, use ordered and inline layers appropriately, and keep cleanup behavior explicit and logged where possible. Reference topics: Policy Layers, Shared Layers, Ordered Layers, Inline Layers, Access Control policy design.