What is the correct order of terms to match the following definitions?

an area on Earth’s surface defined by relatively unchanging cultural or physical traits, often associated with a formal boundary
an area on Earth’s surface defined by one or more linkages and activities occurring in that area
an area on Earth’s surface with boundaries that are based on an individual’s perception, thoughts, and/or knowledge of people and their cultural traits, physical geography, and/or the built environment
(1 point)
Responses

a. formal region
functional region
perceptual region

b. functional region
formal region
perceptual region

c. perceptual region
functional region
formal region

d. formal region
perceptual region
functional region

b. formal region, functional region, perceptual region

try again

a. formal region, functional region, perceptual region