Digital information - data - is recorded on optical discs, such as CDs and DVDs, in the form of microscopic cavities. The recording and optical reading of this information are performed by a laser (monochromatic light source). The smaller the dimensions of these cavities, the more data is stored in the same area of the disc. The limiting factor for reading data is light scattering by the diffraction effect, a phenomenon that occurs when light passes through an obstacle with dimensions on the order of its wavelength. This limitation motivated the development of lasers with emission at shorter wavelengths, making it possible to store and read data in increasingly smaller cavities. In which spectral region is the wavelength of the laser that optimizes data storage and reading on discs of the same area located?
(A) Violet.
(B) Blue.
(C) Green.
(D) Red.
(E) Infrared.