Refer to the exhibit. What would you recommend to a customer who is almost out of slots for 10-Gigabit Ethernet connections in the aggregation module?

A.
Add a second aggregation module.

B.
Move the CSM modules to separate service layer switches.

C.
Move the CSM modules to the access layer Cisco Catalyst 6506 Switches.

D.
Upgrade the Cisco Catalyst 6509 Switches in the aggregation layer to Cisco Catalyst 6513 Switches.