Answer:
D. Design compromises are instituted
F. Product changes decrease.
EXPLANATION:
When the product matures, then the volume of its sales reduces significantly. In this case, it is important that such marketing strategies are implemented so that the sales can be boosted. Product enhancement can be done, new designs can be developed, or price of the product can be changed for that matter.
Operational strategies are the OM strategies that a company uses to reach its goals or objectives . Impact that maturing of a product might have is 'design compromises' are instituted, also product changes might decrease.