Company A and Company B both supply contractual services to a fast paced and growing auto parts
manufacturer with a small local Area Network (LAN) at its local site. Company A performs in-house billing
and invoices services for the local auto parts manufactacturer. Company B provides in-house parts and
widgets services for the local auto parts manufacturers. Which of the following is the BEST method to
mitigate security risk within the environment?

A.
Virtual Private Network

B.
Role-Based access

C.
Network segmentation

D.
Public Key Infrastructure