What is the difference between a Known Error and a Problem?

A. The underlying cause of a Known Error is known. The underlying cause of a Problem is not known

B. A Known Error involves an error in the IT infrastructure, A
C. Problem does not involve such an error.
D. A Known Error always originates from an Incident. This is not always the case with a Problem
E. With a Problem, the relevant Configuration Items have been identified. This is not the case with a Known Error.