A line that is drawn vertically down the earth but is NOT parallel to the Prime Meridian, best describes the meridian of longitude.
What is prime meridian?
Prime Meridian is an imaginary line which divides the earth into eastern and western hemispheres
What do you mean by meridian of longitude?
Meridian of longitude is an imaginary semicircle that runs from north to south direction and joins the two poles. All meridians are of the same length and meet at the poles.
Hence, option 3 is the answer.
To learn more about Prime Meridian and meridian of longitude here
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