GE Transportation produces locomotive engines for sale in countries around the world. After looking at the total market for locomotive engines, the company found that various rail lines wanted different types of engines. Major rail lines in the U$.$S$.$ and South America wanted engines to haul heavy freight. Rail lines in Sweden and Germany were interested in a cleaner, greener locomotive engine. Rail lines operated by several Eastern European countries wanted locomotive engines for running short distances between cities in their own country. GE Transportation is currently manufacturing its GE $4400$ for heavy freight, its Hybrid Eco$-$Engine, and its Dash $9,$ suited for shortline transport.

Refer to Scenario $6\mathrm{.}2.$ GE Transportation is most likely using a$($n$)$ targeting strategy, segmenting by variables.

a$.$ concentrated; geographic location

b$.$ undifferentiated; benefit expectations

C$.$ differentiated; end use

d$.$ concentrated; volume usage

e$.$ differentiated; volume usage