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