Using the Customer Sales list shown above Identify and describe at least three of the following issues that deal specifically with the structure of the database table: a) Any problems with unnecessarily repeated (i.e. redundant) data. b) Any problems with atomicity -that is columns that store more than one piece of information. For example: multiple dates, multiple names, or multiple pieces of address information. c) Any NULL values (if any). d) Any groupings of columns that really belong in separate tables because they really describe different entities