Hotspot Question
You have an Exchange Server 2016 organization named Contoso. You create an organization
relationship with a partner’s Exchange Server organization named Fabrikam. The users in
Fabrikam can view the free/busy information of all the users in Contoso. You need to ensure that
the users in Fabrikam can view the custom Mail Tips configured in Contoso. What command should
you run in Contoso? To answer select the appropriate options in the answer area
Answer: 
Agree with provided answer.
Set-OrganizationRelationship “Fabrikam” -MailTipsAccessEnabled $True
Although, I believe there should be the -Identity parameter before Fabrikam.
https://technet.microsoft.com/en-us/library/ee332326(v=exchg.160).aspx
This is also helpful:
https://technet.microsoft.com/en-us/library/jj649324(v=exchg.150)