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Q&A CBSE12A-2019-C07A #7079

Question:

Damodar Mohan has been informed that there had been a backdoor entry to his computer, which has provided access to his system through a malicious user/programs, allowing confidential and personal infornation to be subjected to theft. It happend because he clicked a link provided in one of the pop-ups from a website announcing him to be winner of prizes worth 1 million Dollars.

Which of the following has caused this out of the following?

(i) Virus

(ii) Worm

(iii) Trojan Horse

Also, mention, what he should do to prevent this infection.