Systems that are built on the OSI framework are considered open systems.What does this mean?

A.
They do not have authentication mechanisms configured by default.

B.
They have interoperability issues.

C.
They are built with internationally accepted protocols and standards so they can easily communicate with other systems.

D.
They are built with international protocols and standards so they can choose what types of systems they will communicate with.

Explanation:
C: An open system is a system that has been developed based on standardized protocols and interfaces. Following these standards allows the systems to interoperate more effectively with other systems that follow the same standards.