Which of the following Color Format is a CSS’s six-digit hexadecimal format is

Which of the following Color Format is a CSS’s six-digit hexadecimal format is the same as color defined in (X)HTML?

2) The _______property is used to set the color of the text.

3) 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?

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

5) Which of the following Selector selects an element if it’s the only child of its parent with its type?