Which of the following is a disadvantage of notebook systems?answerThey are more expensive.The battery is difficult to replace.They require AC power.Productivity apps are difficult to use.

The disadvantages of notebook systems include:

1. They are more expensive: Notebook systems, especially high-end models, can be quite costly compared to desktop computers. This is due to the compact and portable design of notebooks, which requires more expensive components.

2. The battery is difficult to replace: Unlike desktop computers, which are always connected to a power source, notebooks rely on batteries. These batteries can wear out over time and may need to be replaced. However, in many notebook models, the battery is not easily accessible and replacing it can be a complex process.

3. They require AC power: While notebooks can operate on battery power, they still need to be plugged into an AC power source to recharge the battery. This can limit the portability of the notebook, especially in areas where AC power is not readily available.

4. Productivity apps are difficult to use: Some users may find it difficult to use productivity apps on notebooks due to the smaller screen size and lack of a full-sized keyboard. This can make tasks like typing and editing documents more challenging compared to using a desktop computer.