[单选题]ZXUN xAGCF版本升级后，需要检查业务受理是否正常，可以通过建链情况检查链路营帐和AGCF是否建链成功，可以使用如下（ ）操作系统命令进行。
After version upgrade of the ZXUN xAGCF, we need to check whether service handling is normal. To do so, we can run the ( ) command on the operating system to check whether the link between the accounting system and the AGCF is set up successfully. A.netstat -an| grep 7700 B.netstat -an| grep 7711 C.netstat -an| grep 7722 D.netstat -an| grep 7733
