What is the behavior of Cluster XL in a High Availability environment?

[answerhappygod]

What is the behavior of Cluster XL in a High Availability environment?

A. The active member responds to the virtual address and is the only member that passes traffic.
B. The active member responds to the virtual address and, using sync network forwarding, both members pass traffic.
C. Both members respond to the virtual address but only the active member is able to pass traffic.
D. Both members respond to the virtual address and both members pass traffic.