Question: What is meant by the term union compatibility? a . When two or more tables share the same number of columns and when they share

What is meant by the term union compatibility?
a.
When two or more tables share the same number of columns and when they share the same domains.
b.
When two or more tables share the same number of columns.
c.
When two or more tables have the same degree.
d.
When two or more tables share the same (or compatible) domains.

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