Choose the correct interval notation for this subset of the real numbers. 
Definitions:
Valid
Refers to the extent to which a concept, conclusion, or measurement is well-founded and likely corresponds accurately to the real world.
Aching Muscles
A common physical symptom that involves soreness or discomfort in the muscles, often resulting from physical exertion or stress.
Occasional Dizziness
Experiencing a transient sensation of unsteadiness or a feeling of light-headedness at irregular intervals.
Ideal System
A theoretical or conceptual model representing the most desirable or perfect attributes of a system or method.
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