Exam MB-900 topic 1 question 57 discussion

As question is about university I can assume that we should apply Academic Price List. From D365 Licensing Guide: "Applications on the Academic price list must purchase a minimum of 20 full user licenses. This requirement does not apply to existing Academic customers who have previously enrolled on or before October 31, 2016, but these customers are required to maintain at least a 5-seat minimum in accordance with the prior program requirements. ". (https://mbs.microsoft.com/Files/public/365/Dynamics365LicensingGuide.pdf) So, answer depends on date when licenses were bought: 5 or 20. What do you think about it?

I found this information on Microsoft Partner Community web site: Are there a minimum number of users required for the Dynamics 365 subscriptions? Dynamics 365 Plan and the Unified Operations Plan have a minimum seat requirement of 20 users. Dynamics 365 for Retail has a minimum seat requirement of 20 users and Dynamics 365 for Talent has a minimum seat requirement of 5 users. No minimums apply for commercial customers for Dynamics 365 Customer Engagement Plan and Dynamics 365 Customer Engagement Plan applications or Dynamics 365 for Team Members. Microsoft Relationship Sales requires a minimum of 10 seats. Minimums may apply for non-profit or academic customers.

https://mbs.microsoft.com/Files/public/365/Dynamics365LicensingGuide.pdf Based on this guide, if we assume current date as situation the answer is D, 20 full user licenses

10 In order to get a free Dynamics 365 Portal, you need at least 10 enterprise app licenses (so Sales, Customer Service, Field Service, Project Service, or the full Customer Engagement license). Team member licenses do not count towards that number. This number was increased from 5 in the fall of 2018. https://community.dynamics.com/crm/f/microsoft-dynamics-crm-forum/269460/what-is-the-minimum-number-of-licenses-that-you-can-get-the-ms-portal-for-free-of-charge-and-be-microsoft-complient/895609