Which of the following Color Format is a CSS colors can also be defined using th

Which of the following Color Format is a CSS colors can also be defined using the keyword rgb, followed by three numbers between 0 and 255, contained in parentheses and separated by commas, with no spaces between them?

2) Which of the following Color Format is a CSS colors can also be defined using the keyword rgb, followed by three numbers between 0 and 255, contained in parentheses and separated by commas, with no spaces between them?

3) Which of the following CSS3 Color Feature can be used as a macro for whatever the current color is?

4) Which of the following Color Format is a CSS3 HSL value with a fourth value to set the alpha channel value for the color to define the opacity of the element?

5) Which of the following Selector same as :firstline; changed under CSS3 to make pseudoelements obvious?