Which key declares that an index in one table is related to that in another?
(a) primary
(b) secondary
(c) foreign
(d) cross
(a) primary
(b) secondary
(c) foreign
(d) cross
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Right option is (c) foreign
The explanation is: In MySQL, a foreign key is the one which facilitates index relations across tables. It declares that an index in one table is related to that in another and place constraints.