You are creating a flow map showing inward and outward migration between US states, based on census data. What must you consider when you examine the map?

a. The migration numbers are a total that reflect inward migration to some states, offset by outward migration from other states.
b. The inward migration numbers state-by-state have no relationship to outward migration from other states, as far as US totals.
c. The map will show direction, such as from northeast states over states to the south, but will not show specific states residents moved to.
d. The flow pattern map only shows trends regarding preferences, and does not reflect actual movement between states.