Question

ways to avoid a computer virus
ways to catch a computer virus
surf the web and download content safely.
visiting questionable websites.
adjust your web browsers security settings to allow browsing only on trusted sites.
opening suspicious or infected e-mail messages.

Explanation:

• "Surf the web and download content safely" and "Adjust your web browser's security settings to allow browsing only on trusted sites" are preventive measures, so they belong to "Ways to avoid a computer virus".
• "Visiting questionable websites" and "Opening suspicious or infected e - mail messages" are actions that can lead to getting a virus, so they belong to "Ways to catch a computer virus".

Answer:

Ways to avoid a computer virus: Surf the web and download content safely, Adjust your web browser's security settings to allow browsing only on trusted sites.
Ways to catch a computer virus: Visiting questionable websites, Opening suspicious or infected e - mail messages.