Which of the following CSS3 Color Feature like RGB color but adds an alpha channel value to specify the opacity of the color?$?

Which of the following CSS3 Color Feature like RGB color but adds an a

1.	Which of the following CSS3 Color Feature like RGB color but adds an alpha channel value to specify the opacity of the color?$?
A.	RGB
B.	RGBa
C.	RGBaplha
D.	AlphaRGB
Answer» C. RGBaplha