4. a) There are two general approaches to forecasting, explain the differences between them. Give two (2) examples of each [4 4 pts] b) Of the two approaches to forecasting, which one do you consider more effective? State your reason. [4 pts] c) Explain the concepts of tangible and intangible as it relate to producing goods and services [4 pts] d) Explain the effect of 'self-service' and service automation on banks or airlines. [4 pts] e) Differentiate between design capacity and effective capacity [4 pts]