Some common threats to a computer is  

(a) Worms 

(b) Denial of service  

(c) Phishing 

(d) All of these 


All of these are common threats to a computer that could harm its operation, performance, and data security.

  • Worms are self-replicating programs that spread to other computers without user interaction.
  • Denial of service attacks are attempts to overwhelm a server or network with traffic or requests, making it unavailable for legitimate users.
  • Phishing is a type of social engineering attack that uses fraudulent emails or websites to trick users into revealing sensitive information or installing malware.

So, the correct answer is (d) All of these.

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Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 14 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.