The root word for interminable is "terminate." what does this root word mean? what does the prefix "in-" in interminable mean? what does the word interminable mean?

Which of these marketing methods henry ford sell the model t to many people who had never before owned a car? a) offering free maintenance on cars for a full year b) airing television commercials with memorable slogans c) advertising with the new communication outlets such as radio d) offering many different colors and models for buyers to choose from