Question

Which of the following denotes the cardinality of "zero, one, or more" on a relationship line?

1) A perpendicular tick mark near the end of the line and a crow's foot at the line end
2) A circle near the end of the line and a crow's foot at the end of the line
3) Two perpendicular tick marks near the end of the line
4) A circle and a perpendicular tick mark near the end of the line

Answer 1

The correct notation for the cardinality "zero, one, or more" on a relationship line in an ER diagram is a circle near the end of the line and a crow's foot at the end of the line.

Step-by-step explanation:

The question deals with the notation used in an Entity-Relationship (ER) diagram to denote the cardinalities of relationships between entity sets. Cardinality specifies the number of instances of an entity from a relation that can be associated with the relation. In ER diagrams, this is depicted through various symbols on the relationship lines.

The correct notation for the cardinality of "zero, one, or more" in an ER diagram is represented by option 2, which consists of a circle near the end of the line and a crow's foot at the end of the line. The circle indicates "zero" cardinality, meaning it is optional and there might be no instances of the entity associated with another entity, while the crow's foot signifies "many," illustrating that there can be one or more instances associated.