Correct Option: D

span=number[CN] attribute’s value must be an integer and greater than 0. It specifies the number of columns in a group. When span attribute is not in use, colgroup defines a single column group containing one column. width=multi-length[CN] specifies default width of for every column. scope=scope-name[CN] specifies set of data cells for which going header cell gives header information. The headers=idrefs[CN] provides list of header cells that gives header information.