The biggest change affecting computer security that has occurred over the last 30 years has been the transformation of the computing environment from a highly interconnected network of smaller systems to large mainframes.

False

Explanation:

The change that occurred to computing over the last 30 years was the shift from large mainframes to the highly interconnected networks of smaller systems. Users in time past need to be in a fixed location to be able to use the computer, but over the years size of computers were reduced significantly to very portable devices sharing resources over the internet and can have access to a work server fro any location.