I'm going with C. The question does not mention anything about corporate or business. Using P2P isn't as common as Chat or Email. Email has a larger attack surface than Chat.
Agreed B is highly likely to be correct. I was tempted to select email.
Another reason why I go with B is because option D is positioned to trick the candidate.
"D. End-to-end applications" closest match to P2P, so answer is B
Answer is B
"Eliminating unsecured file shares, which are a common way for malware to spread"
https://nvlpubs.nist.gov/nistpubs/specialpublications/nist.sp.800-83r1.pdf
I believe eliminating unsecured file shares in that context would be like a shared drive on the network that isn't secure. If you have a SAN that doesn't require authentication (isn't secured) that would be a problem.
P2P sounds good
The question ask about application type. The keyword is "type". So, D will be eliminated straight away.
Among A, B and C - PGP can be used for email protection and I can't recall but there is protection for chat app too.
P2P such as torrent is the risky one.
P2P file sharing is the process of sharing and transferring digital files from one computer to another.
If you aren’t careful, P2P file sharing can subject you to spyware, viruses, Trojan horses, worms and identity theft. Some P2P applications can even modify or penetrate your computer’s firewall without detection.
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