In Unified Modeling Language (UML)primary Keys Cannot by NULL

question 4

True/False

In Unified Modeling Language (UML)primary keys cannot by NULL.

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Definitions:

Braking Speed

The rate at which a vehicle can decelerate and come to a complete stop, usually measured in meters per second squared (m/s²).

Internal Validity

Relates to the extent to which a study can establish a cause-and-effect relationship between its variables, free from external influence.

External Validity

How broadly a study's conclusions can be extended to various scenarios and populations.

Artificial Atmosphere

A man-made environment that replicates the conditions of a natural atmosphere, often used in space exploration or controlled scientific experiments.