Color can be specified by which of the following ?

Question

Hexadecimal value
Color name
rgb value
rdb value

Answer 1

All of them except for the last one.

Answer 2

*Hexadecimal
*RGB value
*Color name

Answer 3

You can choose the color with:
Hexadecimal - > #00000
RGB--> (255, 255, 255)
RGBA - - >(255, 255, 255, 0.81)
Name - - > Red
Do you change with Css for example :
body {
Background-color: Blue;
/*This is change the background for color blue*/
}