Contrast is defined by a pixel's grayscale value: the higher the number, the brighter the pixel.

Which of the following biometric methods scans the ridges of a finger for matching?

A. fingerprint scanning B. finger scan C. hand geometry scan D. hand topography scan

If a system appears to be having issues with performance for read and write operations to a hard disk, which of the following is not a valid scheduling method that you could try to improve performance?

A. testwr B. noop C. cfq D. deadline