What is the difference between deep packet inspection and stateful inspection?

What is the difference between deep packet inspection and stateful inspection?
A . Deep packet inspection gives insights up to Layer 7, and stateful inspection gives insights only up to Layer 4.
B . Deep packet inspection is more secure due to its complex signatures, and stateful inspection requires less human intervention.
C . Stateful inspection is more secure due to its complex signatures, and deep packet inspection requires less human intervention.
D . Stateful inspection verifies data at the transport layer and deep packet inspection verifies data at the application layer

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Answer: B