How Many DNS Root Servers Are There

question 47

Multiple Choice

How many DNS root servers are there?

• A)1
• B)2
• C)10
• D)13

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Definitions:

Absolute Threshold

The minimum intensity of a stimulus required to be perceivable by our senses.

Sensory Adaptation

The process by which sensory receptors become less sensitive to constant stimuli over time, allowing organisms to focus on changes in their environment.

Just Noticeable Difference

The minimal change in a stimulus that can just barely be detected by an organism.

Absolute Threshold

The minimum intensity of a stimulus that can be detected by an organism's sensory systems at least 50% of the time.