What does this code do?

Code:
 @media only screen and (max-width: 500px) {
    body {
        background-color: lightblue;
    }
}

A. Scaled Vector Graph B. Scalable Vector Graphics C. Scaled Vector Graphics D. None of the mentioned

A. cx B. cy C. rr D. ry

A. x B. y C. x1 D. all of the mentioned

A. text B. stroke C. line D. all of the mentioned