Select each correct statement below: Group of answer choices Development times for new aerospace products can be from 7 to 10 years and this makes it harder to estimate overall development costs. Because the aerospace customer base is large, economies of scale are easy for manufacturers to achieve. Because the aerospace customer base is limited, economies of scale are difficult for manufacturers to achieve. Development times for new aerospace products can be from 7 to 10 years and this makes it easier to estimate overall development costs