Q: What is a potential attack vector for utilities such as the power grid?
A: The Internet is a potential attack vector for such machines if connected, but the Stuxnet worm demonstrated that even equipment controlled by computers not connected to the Internet can be vulnerable to physical damage caused by malicious commands sent to industrial equipment (in that case uranium enrichment centrifuges) which are infected via removable media.
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Available choices: 1. yes 2. no
1.