KAL-AP on the Cisco ACE allows communication with Cisco ACE Global Site Selector， to report virtual IP and real server availability. Which statement is true about KAL-AP？（）

• A、 It is a Cisco propriety keepalive.
• B、 It supports a maximum of 256 KAL-AP entries.
• C、 It supports a maximum of 256 KAL-AP keepalives.
• D、 It is used for both Cisco and non-cisco load balancers.