Q4. From the table below: (2 points) CUS_INITIAL CUS AREACODE 615 713 615 615 CUS CODECUS LNAME 10010 Ramas 10011 Dunne 10012 Smith 10013 Olowski 10014 Orlando 10015 O'Brian 10016 Brown 10017 Williams 10018 Farriss 10019 Smith CUS_FNAME Alfred Leona Kathy Paul Myron Amy James George Anne Olette 615 CUS PHONE | CUS BALANCE 844-2573 0.00 894-1238 0.00 894-2285 896.54 894-2180 1285.19 222-1672 673.21 442-3381 1014.56 297-1228 0.00 290-2556 0.00 382-7185 0.00 297-3809 453.98 713 615 G 615 713 615 Identify the following keys wherever possible: a. The primary key b. 3 superkeys c. A candidate key (other than the primary key) d. The foreign keys e. A secondary key