The correct answer is C. Solid state.
A direct view storage tube (DVST) is a type of cathode ray tube (CRT) display that was used in early computer monitors. It is a non-flat panel display.
Very large-scale integration (VLSI) is a process of manufacturing integrated circuits (ICs) with large numbers of transistors. It is not a type of display technology.
An RGB monitor is a type of computer monitor that uses red, green, and blue light to create an image. It is not a flat panel display.
A solid state display is a type of display that uses electronic components that are not made of glass or other traditional materials. It is a flat panel display.
Flat panel displays are based on solid state technology. Solid state displays are made up of thin layers of materials that are arranged in a matrix. The materials in the matrix can be switched on or off to create an image. Solid state displays are lighter and thinner than traditional CRT displays. They are also more energy efficient.