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OPTION D IS CORRECT ANSWER <<<<<<<<<<<<<<<<
The answer is :D. the Internet
Delivery of digital products can be handled in a fairly smooth way by allowing customers to access their purchase over the Internet .
For more information please visit this link :
http://www.knowthis.com/managing-product-movement/transportation-features-and-modes
Best Regards
Option ( D ) is the right answer
D : internet is the right is the right mode of transportation
D. The internet ..............,,,,,,,,,,