问题：
[单选题]21、 When configuring your ASA to use more than one NTP server, what parameter decides whether one server is used or the other?当配置ASA使用多个NTP服务器时，什么参数决定了这个服务器被使用还是另外一个服务器被使用?
A. Priority
B. Preferred
C. Accuracy
D. Trusted key
答案解析：
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