Adding members to workspaces - Doubt

Hi,

I have a Power BI Certification exam scheduled and I was going through the practice questions provided by Microsoft. I found some contradictory information and would very much appreciate the support.

Question:
You need to provide a user with the ability to add members to a workspace. The solution must use the principle of least privilege.
Which role should you assign to the user?

1. Viewer
2. Admin
3. Contributor
4. Member

I selected Member as only they have the ability to add users other than Admins according to https://learn.microsoft.com/en-us/power-bi/collaborate-share/service-roles-new-workspaces

However, that answer was marked as incorrect and it was mentioned that Contributor is the right answer in the explanation. If "Member" is indeed the right answer, I am worried that if I get a similar question in the exam, that might be incorrectly marked incorrect as well. 

Please help, Thanks in advance!