Thank you for posting your question here at brainly. I hope the answer will help you. Feel free to ask more questions.
Below are the choices that can be found from other choices:
A) anti-virus software
B) spyware
C) encryption software
D) a Trojan horse
E) a worm
answer is C because The encryption system works by locking an e-mail message to a unique code number for each computer so only that computer, not others, can open and read the message.
