单项选择题
A DRDA host database resides on a z/OS or an i5/OS system and listens on port 446. The TCP/IP address for this system is 192.168.10.1 and the TCP/IP host name is myhost. Which of the following commands is required to update the local node directory so that a DB2 client can access this DRDA database?（）
A.CATALOG TCPIP NODE myhost REMOTE db2srv SERVER 446
B.CATALOG TCPIP NODE mydb2srv REMOTE myhost SERVER 446
C.CATALOG TCPIP NODE myhost REMOTE db2srv SERVER 192.168.10.1
D.CATALOG TCPIP NODE mydb2srv REMOTE myhost SERVER 192.168.10.1
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