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The completeness constraint may be one of the following: Total generalization or specialization, Partial generalization or specialization. Which is the default?

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The completeness constraint may be one of the following: Total generalization or specialization, Partial generalization or specialization. Which is the default?

(a) Total

(b) Partial

(c) Should be specified

(d) Cannot be determined

This question was posed to me in exam.

My enquiry is from Extended E-R Features topic in section Database Systems Design and Implementation of Database Management

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Correct choice is (b) Partial

For explanation: Partial generalization or specialization – Some higher-level entities may not belong to any lower-level entity set.

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