Answer: B
Explanation:
if each color can be represented as 8 bits and you have 3 colors total that would mean you would need 24 bits to represent the entirety of the RGB spectrum. And each bit can either be on or off so you have two choices for each one. So the total amount of colors you can have for 8bit RGB would be 
which is 16,777,216.
D. A window the rest are incorrect
Answer:
Sensing elements.
Explanation:
Sensing elements are the device which connect channels feedback and return it to the control system input. There are many sensors used for feedback control such as Tachometer, Encoders, Accelerometers and rate gyroscopes.
Answer:
C. ground antennas
Explanation:
AKA Satellite Dishes That Communicate Just Like Direct Tv dish It is focused by a bowl-shaped parabolic dish onto a device in the center called a "feed horn", which channels the signal to a "low-noise block down converter" (LNB) which filters out unwanted interference, and sometimes converts it to yet another frequency before amplifying it and sending it to the satellite receiver
