The correct answer is C. Ordered Access Control Layers are evaluated in sequence, and each layer functions as an independent rulebase with its own rules and cleanup behavior. A connection must satisfy the policy logic across the ordered layers unless a terminating action, such as Drop, stops processing. Options A and D are wrong because ordered layers are not analyzed in parallel, and their action logic is not "strictest in parallel" or "accept if any layer accepts." Option B is overcomplicated and does not describe the official enforcement model. The accurate mental model is this: each ordered layer is checked independently in order; a Drop is final; an Accept can allow evaluation to continue into subsequent layers; if no rule matches within a layer, that layer's cleanup behavior applies. This layered model lets administrators separate policy concerns, such as network firewall logic in one layer and application/URL controls in another, while keeping enforcement deterministic. Reference topics:
Ordered Layers, Access Control Policy, layer independence, rulebase enforcement order.