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Primary key of the table below

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Reference no: EM131097551

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

Reference no: EM131097551

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