(Answered) Which of the following is the primary key of the table

Economics

Which of the following is the primary key of the table below (you can assume the data are representative)?

STAFF_NUM	STAFF_NAME	BRANCH_NUM	BRANCH_ADDRESS	POSITION
S100	Smith, J	B100	Pseudopolis	Manager
S100	Smith, J	B200	Ankh	Sweeper
S295	Vetinari, H	B100	Pseudopolis	Patrician
S331	Colon, S	B100	Pseudopolis	Clerk

Select one:

a. STAFF_NUM

b. There is no primary key because STAFF_NUM repeats meaning this is not a valid relation

c. BRANCH_NUM

d. STAFF_NUM, BRANCH_NUM

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Macroeconomics, Economics

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