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You are given an E-R diagram with two entities, ORDER and CUSTOMER, as shown above. What does the symbol next to the ORDER entity indicate?

• A maximum cardinality of "zero"

• A maximum cardinality of "one"

• A minimum cardinality of "optional"

• A minimum cardinality of "required"
Source  Download Study Guide
Database Processing: Fundamentals, Design, and Implementation
Edition: 15th
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A minimum cardinality of "optional"
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