Age is best modelled as which kind of attribute?

Question

Accepted Answer

A. derived from DateOfBirth and today's date

Age changes every year while DateOfBirth is stable.
Storing Age directly means it goes stale.
**NPTEL's example uses exactly this:** Age depends on DateOfBirth, so it is a derived attribute, computed when needed rather than stored.

Answer

composite of year and month components

Answer

multi-valued, one entry per birthday

Answer

simple single-valued, stored on every form

Age is best modelled as which kind of attribute?

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