多选题 查看以下输出并回答问题。 (Cisco Controller)＞debug? aaa Configures the AAA debug options． airewave-director Configures the Airewave Director debug options ap Configures debug of Cisco AP. arp Configures debug of ARP. bcast Configures debug of broadcast. cac Configures the call admission control(CAC) debug options. cdp Configures debug of cdp. crypto Configures the Hardware Crypto debug options. dhcp Configures the DHCP debug options． client Enables debugs for common client problems. disable-all Disables all debug messages. dot11 Configures the 802.11 events debug options． dot1x Configures the 802.1X debug options． iapp Configures the IAPP debug options． ccxrm Configures the CCX_RM debug options． ccxdiag Configures the CCX Diagnostic debug options． 哪种调试用来对基于端口的认证问题进行故障排错? a．ar9 b．cdp c．dot11 d．dot1x