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以下选项哪个命令是用 hadoop 用户登录，通过 scp 命令实现密钥拷贝到 slave1 节点上()

（A）scp ~/.ssh/id_rsa.pub hadoop@slave2:~/

（B）scp ~/.ssh/id_rsa.pub root@slave1:~/

（C）scp ~/.ssh/id_rsa.pub hadoop@slave1:~/

（D）scp ~/.ssh/id_rsa.pub slave1@root:~/