Examine the following items， which one offers a variety of security solutions， including firewall， IPS， VPN，antispyware， antivirus， and antiphishing features？（）
- A、Cisco IOS router
- B、Cisco PIX 500 series security appliance
- C、Cisco 4200 series IPS appliance
- D、Cisco ASA 5500 series security appliance
正确答案:D
答案解析:有
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