单项选择题
A.mysqldump navy2>/data/navy2.sqlB.mysql -h 192.168.1.100navy2>/data/navy2.sqlC.mysqldump -h192.168.1.100-uxx -p navy2>/data/navy2.sqlD.mysqldump 192.168.1.100:navy2>/data/navy2.sql
A.mysqldump navy2test >/data/test.sqlB.mysql navy2test >/data/test.sqlC.output navy2test >/data/test.sqlD.navy2test >/data/test.sql
A.firewalld -add-port 3306/tcp --permanentB.firewall-cmd -add-port 3306/tcp --permanentC.firewall -add-port 3306/tcp --permanentD.firewall-cmd -add-port 3306/tcp