Which of the following are the valid categories of hand geometry scanning?

A.
Electrical and image-edge detection.

B.
Mechanical and image-edge detection.

C.
Logical and image-edge detection.

D.
Mechanical and image-ridge detection.

Explanation:
Hand geometry reading (scanning) devices usually fall into one of two categories:
mechanical or image-edge detection. Both methods are used to measure specific
characteristics of a person’s hand such as length of fingers and thumb, widths, and
depth.