What Is the Difference Between a Known Error and a Problem

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.