What is a precedence of traffic inspection for the defined polices?

On the following graphic, you will find layers of policies.

What is a precedence of traffic inspection for the defined polices?
A . A packet arrives at the gateway, it is checked against the rules in the networks policy layer and then if implicit Drop Rule drops the packet, it comes next to IPS layer and then after accepting the packet it passes to Threat Prevention layer.
B . A packet arrives at the gateway, it is checked against the rules in the networks policy layer and then if there is any rule which accepts the packet, it comes next to IPS layer and then after accepting the packet it passes to Threat Prevention layer
C . A packet arrives at the gateway, it is checked against the rules in the networks policy layer and then if there is any rule which accepts the packet, it comes next to Threat Prevention layer and then after accepting the packet it passes to IPS layer.
D . A packet arrives at the gateway, it is checked against the rules in IPS policy layer and then it comes next to the Network policy layer and then after accepting the packet it passes to Threat Prevention layer.

Answer: B

Explanation:

To simplify Policy management, R80 organizes the policy into Policy Layers. A layer is a set of rules, or a Rule Base. For example, when you upgrade to R80 from earlier versions: When the gateway matches a rule in a layer, it starts to evaluate the rules in the next layer. All layers are evaluated in parallel