You manage an Office 365 tenant.
Some users report that email attachments with the extension .tst from a vendor are being removed and deleted.
You need to ensure that emails with the specific attachments can be delivered to the users.
Which Windows PowerShell cmdlet should you run?

A.
Set-CsPrivacyConfiguration

B.
Start-ManagedFolderAssistant

C.
Set-MailboxJunkEmailConfiguration

D.
Set-CSUser

E.
Set-HostedContentFilterPolicy

F.
New-RetentionPolicyTag

G.
Enable-JournalRule

H.
Set-MalwareFilterPolicy

Explanation:
References: https://technet.microsoft.com/en-us/library/jj215689(v=exchg.160).aspx