You are styling a box object on a page by using CSS3.
You need to set the transparency of the object to 50%.
Which two CSS3 styles will achieve the goal? (Each correct answer presents a complete solution. Choose two.)

A.
Option A

B.
Option B

C.
Option C

D.
Option D

Explanation:
The RGBA declaration allows you to set opacity (via the Alpha channel) as part of the color value.
Example:
div { background-color: rgba(255,0,0,0.5); }
The background color has been set to blue, and the opacity set to half.
Example 2:
background-color: rgb(0,0,255); opacity: 0.5;
The background color has been set to blue, and the opacity set to half.
A brief introduction to Opacity and RGBAhttp://www.css3.info/introduction-opacity-rgba/