Concept:Information processing with computers improves efficiency and reduces long-term running costs.Explanation:Option A is incorrect because reduced face-to-face interaction is a disadvantage.Option B is incorrect because high initial investment cost is also a disadvantage.Option C is correct because using information processing systems lowers running costs over time.Option D is incorrect because training and retraining staff is usually an extra cost, not an advantage.Answer:C. running cost becomes lower in the long term