What is the key difference between the pricing models for Connect:Direct Premium versus Standard editions?

What is the key difference between the pricing models for Connect:Direct Premium versus Standard editions?
A . The Premium edition can talk to many endpoints, while the Standard edition can only talk to one endpoint
B . The Premium edition is priced by PVUs, while the Standard edition is priced by simultaneous sessions
C . The Premium edition includes the C:D High Speed add-on for long distance and large file transport, and this add-on is available for purchase on the Standard edition
D . The price of the Premium edition includes unlimited non-production environments, while the environments are limited on the Standard edition

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Answer: B

Explanation: https://www.ibm.com/developerworks/community/forums/html/topic?id=48cabedd-37f4-45db-8801-9efeb77929fe