Which topology is not supported when using vPC?

A.
a single-homed server to a single FEX that is connected to two Cisco Nexus 5500 Series
Switches

B.
a dual-homed server to two FEXs, each connected to two Cisco Nexus 5500 Series Switches

C.
a dual-homed server to two FEXs that are connected to one Cisco Nexus 5500 Series Switch

D.
a dual-homed server to a single FEX that is connected to two Cisco Nexus 5500 Series
Switches