Which CSS will cause your links to have a solid blue background that changes to semitransparent on hover?
a { color: blue; } a:hover { background: white; }
a:hover { background: rgba(blue, 50%); } a:link { background: rgba(blue); }
a:link { background: #0000ff; } a:hover { background: rgba(0, 0, 255, 0.5); }
a:link { background: blue; } a:hover { color: rgba(0, 0, 255, 0.5); }