单选题（）is a technique used for illumination behind the liquid crystal display that makes LCDs easier to read.A FrontlightB Backup PowerC Cathode ray tubeD Backlight
题目
单选题
（）is a technique used for illumination behind the liquid crystal display that makes LCDs easier to read.
A
Frontlight
B
Backup Power
C
Cathode ray tube
D
Backlight