How should you complete the relevant Windows PowerShell script?

Explanation/Reference:
Explanation:
We use the New-Mailbox cmdlet to create a new mailbox. Then we use the Add-RecipientPermission cmdlet to grant the SendAs permission on the mailbox to [email protected].
Box 1: We use the -Shared option to create a shared mailbox with the name of Sales1.
Box 2. We use the Add-RecipientPermission to add a permission (in this case SendAs permission) to the Sales1 mailbox. Box 3. We need to select the SendAs permission to enable User1 to send messages from the Sales1 mailbox
Box 4. We need the -Trustee option to enable us to specify that we’re granting the SendAs permission to a user ([email protected]).
References:
https://technet.microsoft.com/en-gb/library/ff935839(v=exchg.150).aspx