In this case I would day D is the correct answer.
The Stateful inspection operates primarily at the transport and network layers of the OSI model. It's got good security and transparency as it can analyze upper layer information.
I think D, this inspection affects in the performance on the FW because must be mantain the connections table.
About C answer:
https://www.tchk.net/download/Stateful_Inspection.pdf (page 7 from this PDF)
With Stateful Inspection, the packet is intercepted at the network layer, but then the INSPECT Engine takes over. It extracts state-related information required for the security decision from ALL APPLICATIONS LAYERS and maintains this information in dynamic state tables
so "C" in this context is false. The Stateful Inspection always screening above network layer
I think D,
https://www.checkpoint.com/cyber-hub/network-security/what-is-firewall/what-is-a-stateful-firewall/
Stateful firewalls have the same capabilities as stateless ones but are also able to dynamically detect and allow APPLICATION communications that stateless ones would not. Stateless firewalls are not application aware—that is, they cannot understand the context of a given communication.
I think D is correct, since stateful inspection do check up to the application layer.
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