Which statement best describes the vertical archipelago found in the Inca Empire?
a) The vertical archipelago refers to the extensive network of bridges connecting different regions.
b) The vertical archipelago is a system of terraced fields on mountain slopes used for agriculture.
c) The vertical archipelago involves the Inca's mastery of navigation in the Pacific Ocean.
d) The vertical archipelago represents the Inca's approach to urban planning and city organization.
