Which layer of a system should security elements be positioned in?

Which layer of a system should security elements be positioned in?

A.
Highest level

B.
Middle level

C.
Lowest level

D.
Makes no difference

Explanation:
Security elements should be placed in the lowest level of a system
architecture in order to improve the overall performance. Security components that
are in the lower layers of a security architecture provide a wider range of
protection because they provide a foundational level of security for all of the
components on top of them. They also have a smaller effect on processing and
performance when compared to security mechanisms in the higher level of a system’s
architecture.