To which of the following categories the mobile apps belong?

1. They are hardware
2. They are system software
3. They are application software
4. They are internet devices

Which of the following programming languages is not used in developing mobile apps?

1. Java
2. C++
3. Python
4. HTML

The websites are designed using CSS. What does CSS mean?

1. Cading Style Sheets
2. Cascading Style Sheets
3. Cash coding Style Sheets
4. Casing Style Sheets

Which of the following mobile app is developed by Zuckerberg?

1. YouTube
2. Skype
3. Twitter
4. Facebook