We can define a buffer as a temporary holding area for data between the various devices and the CPU make I/O synchronization especially if there are multiple devices attempting to do I/O at the same time.
Items stored at the buffer helps to reduce the The incompatibilities in speed between the various devices and the CPU.
Option 2 is correct because most of the components used in laptop is far different from Desktops. They are not able to fix in desktops. They are designed specially for laptops.
