Why would you recommend a Cisco Catalyst 6509 Switch instead of a Cisco Catalyst 6513 Switch in an aggregation module design?

Why would you recommend a Cisco Catalyst 6509 Switch instead of a Cisco Catalyst 6513 Switch in an aggregation module design?

A.
A larger number of horizontally aligned slots are needed.

B.
A larger number of 10-Gigabit Ethernet ports are needed.

C.
A larger number of service modules are needed.

D.
A larger number of single-channel line cards will be used.