HOTSPOT
Fabrikam, Inc. employs 500 users and plans to migrate to Office 365.
You must sign up for a trial plan from the Office 365 website. You have the following requirements:
Create the maximum number of trial users allowed.
Convert the trial plan to a paid plan at the end of the trial that supports all of Fabrikam’s users.
You need to create an Office 365 trial plan.
How should you configure the trial plan? Select the correct answer from each list in the answer area.
Answer: 
Explanation:
Two trials are available.
P1 allows 10 trial users and 25 when live full paid subscription.
E3 allows 25 trial users and unlimited when live full paid subscription.
So I would say the answer above is correct. E1 allows unlimited users but has no trial option. Could convert to E1 after the trial maybe??