What might lead to getting a virus on your machine

Question:
What might lead to getting a virus on your machine?
Downloading ___1___ or clicking on ___2___ might lead to a virus on your machine.

1. untrustworthy software
2. large computer updates
3. new emails with images
4. suspicious links
5. strange search results

Answer:
1 - A is the correct answer
2 - D is the correct answer