16. Consider the following table in a relational database. Last Name Smith Jones Rank Manager 234 Mornin stodian33 Afternoon Cu Smith Custodian 33 33 Evening Doe Clerical 222 Morning According to the data shown in the table, which of the following could be a candidate key of the table? (A) (Last Name (B) [Room) (C) (Shit) (D) (Rank, Room (E) (Room, Shit) E (Room, Shift)