Your company has four Active Directory sites. A Hub Transport server role and a Mailbox server role are installed at each site. The network is configured as shown in the following diagram

You need to ensure that messages between the Chicago and Seattle sites are routed through ExchHub2 in the Dallas site.
Which cmdlet should you run?

A.
Set-AdSiteLink -Identity SEA-DAL -ExchangeCost 5

B.
Set-AdSiteLink -Identity SEA-DAL -ExchangeCost 25

C.
Set-AdSite -Identity Dallas -HubSiteEnabled $false

D.
Set-AdSite -Identity Dallas -HubSiteEnabled $true