The Crow’s foot symbol with two vertical parallel lines indicates option c. (1,1) cardinality.
Crow's foot diagrams is one that stands for entities as boxes, and its association as lines that exist between the boxes.
Note that different shapes at the ends of these lines stands for the relative cardinality of the relationship and thus The Crow’s foot symbol with two vertical parallel lines indicates option c. (1,1) cardinality.
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