The box marked 4 in the accompanying figure is a ___. 1. content column 2. sidebar column 3. main column 4. section column To display a background image once the value of the background-repeat property should be set to ___ 1. no-repeat 2. repeat-no 3. none 4. once If the text-align property has a value center, the text will have ___ margin (s). 1. ragged left and right 2. justified left and right 3. ragged right 4. justified left and ragged right