Once ______ has infected a substantial number of computer systems, it generates revenue either by displaying advertisements or using “pay per click” mechanism to charge its clients against the number of clicks on their displayed ads.

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**Solution:**

1. **Adware** is a type of software that automatically displays or downloads advertising material (often unwanted) when a user is online.

2. Once adware infects a substantial number of computer systems, it generates revenue by displaying advertisements or using the "pay per click" mechanism, charging clients based on the number of clicks on their ads.

3. Worms and viruses are primarily designed to spread and cause damage or disruption, not specifically to generate revenue through ads.

4. Spyware collects information about users without their knowledge but does not primarily generate revenue through ads.

**Answer:** adware

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