Jenny’s boss says that he already has security that accepts messages only from trusted sources, so he does not need more security. Is he right? Why or why not?

No. A message can be spoofed so that it appears to come from a trusted source, even when it was sent by an attacker. That means trusted-source filtering alone may not keep every harmful message out; Jenny’s boss should use additional security measures. Choice B, “No, because spoofing fools trusted-source security,” is correct.

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