Which switch is not a valid Cisco Nexus 7000 Series model? 

Answer options:

A. Cisco Nexus 7000 4-slot switch
B. Cisco Nexus 7000 8-slot switch
C. Cisco Nexus 7000 9-slot switch
D. Cisco Nexus 7000 10-slot switch
E. Cisco Nexus 7000 18-slot switch

B