A firewall located on an organization’s network perimeter can be used to protect against which type of attack?

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A firewall located on an organization’s network perimeter can be used to protect against which type of attack?
A . a malicious SaaS application file accessed from an unmanaged mobile phone
B . ransomware installed from an infected USB drive
C . malware installed on the laptop by a disgruntled employee
D . a malicious PDF file located on an internet website

Answer: D