What should you do?

You are employed as the network administrator at Domain.com. The Domain.com network consists of a single Active Directory domain named Domain.com. All servers on the Domain.com network run Windows Server 2008 and all client computers run Windows XP Professional.
The Domain.com network has alternate locations at two different sites. At present a T1 line as well as a dial-up line is used for redundancy connecting the sites. You receive an instruction from the CIO to determine whether replication occurs normally on the T1 line as well as ensuring that the dial-up line is only there as back up in the event of T1 going down.
What should you do?

A.
This can be accomplished by raising the cost of the dial-up line.

B.
This can be accomplished by lowering the cost of the T1 line.

C.
This can be accomplished by lowering the cost of the dial-up line.

D.
This can be accomplished by raising the cost of the T1 line.

Explanation:
Lower costs are preferred over higher costs. However, if the lower cost connection fails for any reason, the higher cost link will then be utilized.