What is the best practice for setting the WLC v7.0 use of WLAN QoS settings to support SIP phones on a VoWLAN?

What is the best practice for setting the WLC v7.0 use of WLAN QoS settings to support SIP phones on a VoWLAN?
A . Configure SIP with static CAC only with SIP call snooping.
B . Configure SIP with static CAC only without SIP call snooping.
C . Configure SIP with load-based CAC only with SIP call snooping.
D . Configure SIP with load-based CAC only without SIP call snooping.
E . Configure SIP with load-based CAC and TSPEC only with SIP call snooping.

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Answer: A