All of the following are examples of products in which companies use the time availability dimension to implement product proliferation EXCEPT:a.) Plastic producers sometimes sell high-quality plastics for rigorous uses and degraded product for less-severe uses.b.) Package services, such as FedEx, deliver before 10 a.m. but also later the same day for different prices.c.) Publishers offer hardcover books for enthusiasts and paperback books for those who can't wait.d.) Airlines develop a variety of products for a single flight based on time of booking and availability capacity.

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