HOTSPOT
Contoso, Ltd., has an Office 365 tenant. All employees have Exchange Online mailboxes. You create a shared mailbox named SharedMailbox1@contoso.com.
You need to grant full mailbox access to User1@contoso.com for the SharedMailbox1 mailbox.
How should you complete the relevant Windows PowerShell commands? To answer, select the appropriate
Windows PowerShell commands from each list in the answer area.
Hot Area:
https://technet.microsoft.com/en-us/library/bb124097(v=exchg.160).aspx
Answer: 
Explanation:
The Add-MailboxPermission is available in on-premises Exchange Server 2016 and in the cloud-based service.
Some parameters and settings may be exclusive to one environment or the other.
Use the Add-MailboxPermission cmdlet to add permissions to a mailbox.It applies to Exchange Online and
Exchange Server.
Example:
This example grants Kevin Kelly full access to Terry Adams’s mailbox.Add-MailboxPermission -Identity “Terry Adams” -User KevinKelly -AccessRights FullAccess -InheritanceType
All
References:
shouldn’t this be trustee and not user? or is the previous similar question that uses trustee incorrect?
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scratch that the correct syntax can be found in this link:
https://technet.microsoft.com/en-us/library/ff935839(v=exchg.160).aspx
Correct Answer is Add-RecipientPermission, SharedMailbox1@contoso.com, -Trustee User1@contoso.com
also answer offered is correct according to the following link:
https://technet.microsoft.com/library/bb124097(EXCHG.80).aspx
in this case which option would you use both do the same thing and both options are available here. therefore this can be considered a double edged sword with no correct answer.
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I believe you use the Recipient and Trustee syntaxes only when you need to provide the user with Send As permissions.
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The answer is fully correct. Look, you need to grant User1 with *full access* to the shared mailbox. So, there are no options. You have to use Add-MailboxPermission cmdlet
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