D? Really? Anti-virus for mobile devices? That's like using a paper bag to protect yourself from a nuclear blast. This question is a no-brainer - it's B all the way!
I'm leaning towards C. Hardening and patching systems is crucial, but a secondary authentication process goes beyond that to add an extra layer of protection.
Definitely not A, that's just confusing jargon. I think the correct answer is B - adding a secondary authentication process is a key part of the defense-in-depth strategy to enhance security.
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