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?

A. Color Style Sheets B. Cascade Sheets Style C. Cascade Style Sheet D. Cascading Style Sheets

A. Selector B. Attribute C. Value D. Tag

A. Selector B. Rule C. Declaration D. None of the above

A. id B. class C. tag D. all of the mentioned