The default value for the background-repeat property is _____. 1. repeat 2. repeat-xy 3. repeat-x 4. repeat-y a: link { color: yellow: background-color, #8b0000: font-weight, bold: } a: visited { color: gray: text-decoration: none: } In the accompanying figure link and visited both are ______. 1. dependent class selectors 2. pseudo-class selectors 3. pseudo-class properties 4. none of the above The power of a CSS external style sheet is in _____. 1. its ability to determine the appearance of many documents 2. its simplicity 3. its portability 4. all of the above