Which CSS will cause your links to have a solid blue background that changes to semitransparent on hover?

1. a:link {
     background: #0000ff;
   }
   a:hover {
     background: rgba(0, 0, 255, 0.5);
   }

2. a {
     color: blue;
   }
   a:hover {
     background: white;
   }

3. a:link {
     background: blue;
   }
   a:hover {
     color: rgba(0, 0, 255, 0.5);
   }

4. a:hover {
     background: rgba(blue, 50%);
   }
   a:link {
     background: rgba(blue);
   }

Correct Answer:

• a:link {
    background: #0000ff;
  }
  a:hover {
    background: rgba(0, 0, 255, 0.5);
  }