The correct answer is C. Both A and B.
A VDU, or Visual Display Unit, is a device that displays text and images on a screen. It is also known as a monitor or screen. VDUs are used in a variety of devices, including computers, televisions, and smartphones.
A screen is a flat surface on which images are displayed. It is typically made of glass or plastic, and it can be either monochrome or color. Screens are used in a variety of devices, including computers, televisions, and smartphones.
A monitor is a device that displays text and images on a screen. It is typically connected to a computer, and it can be either monochrome or color. Monitors are used in a variety of applications, including office work, gaming, and watching movies.
A printer is a device that prints text and images on paper. It is typically connected to a computer, and it can be either inkjet or laser. Printers are used in a variety of applications, including office work, home printing, and graphic design.
None of these is not the correct answer.