how many PCIe 3.0 slots?

The Cisco UCS C220 M3 Rack Server has how many PCIe 3.0 slots?

A.
1 PCie Generation 3.0 slot

B.
2 PCIe Generation 3.0 slots

C.
3 PCIe Generation 3.0 slots

D.
4 PCIe Generation 3.0 slots