Consider the following table in a relational database. Last Name Rank Room Shift Smith Manager 234 Morning Jones Custodian 33 Afternoon Smith Custodian 33 Evening Doe Clerical 222 Morning According to the data shown in the table, which of the following could be candidate keys of the table? a) {Last Name} b) {Room} c) {Shift} d) {Rank, Room} e) {Room, Shift}

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