How must UCS fabric interconnects be connected to achieve high-availability?

A.
Cluster port L1 on UCS A must be connected to Cluster port L2 on UCS B

B.
Cluster port L1 on UCS A must be connected to cluster port L1 on UCS B

C.
The UCS 2104XP IOM A of each chassis must be connected to the UCS 6100 A using only 1 uplinks

D.
The UCS 2104XP IOM A of each chassis must be connected to the UCS 6100 B using 1 to 4 uplinks