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A company is getting a new sales system that must remain secure and isolated. The network administrator needs to segregate network traffic for security reasons. Currently there is one addressing scheme 10.2.10.x, with a subnet mask of 255.255.255.0.Which of the following methods would BEST help in segregating the traffic?

A. Implementing a dedicated broadcast network B. Implementing a dedicated multicast network C. Changing the IP scheme to class C addresses D. Creating a new subnet for this system