The relational database environment has all of the following components except Select one: O a. Relations b. Separate files Oc. Query languages O d. Records if you would like to remove a guest's record from the guests' relation, which of the following is the correct way Select one: O a REMOVE FROM guests WHERE gid="[gid]": O b. DELETE FROM guests WHERE gid="[gid]'LIMIT 1; oc ALTER guests DROP WHERE firstname 'firstname' AND Iname="llname' LIMIT 1 o d. DELETE FROM guests WHERE firstname = 'firstnamel' AND Iname = 'flname)' LIMIT 1