What is the limitation of employing Sticky Decision Function?

What is the limitation of employing Sticky Decision Function?
A . With SDF enabled, the involved VPN Gateways only supports IKEv1
B . Acceleration technologies, such as SecureXL and CoreXL are disabled when activating SDF
C . With SDF enabled, only ClusterXL in legacy mode is supported
D . With SDF enabled, you can only have three Sync interfaces at most

Answer: B