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which of the following techniques supports availability?

When considering a vendor-specific vulnerability in critical industrial control systems which of the following
techniques supports availability?

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A.
Deploying identical application firewalls at the border

B.
Incorporating diversity into redundant design

C.
Enforcing application white lists on the support workstations

D.
Ensuring the systems’ anti-virus definitions are up-to-date

Explanation:
If you know there is a vulnerability that is specific to one vendor, you can improve availability by implementing
multiple systems that include at least one system from a different vendor and so is not affected by the
vulnerability.

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