which of the following is true regarding the 0° prime meridian?
a. The 0° prime meridian runs through the Royal Observatory in Greenwich, England.
b. The 0° prime meridian is used as the starting point for measuring longitude around the world.
c. The 0° prime meridian was officially established at the International Meridian Conference in 1884.
d. The 0° prime meridian divides the Earth into the Eastern Hemisphere and the Western Hemisphere.