Oracle 19c，PASSWORD_VERIFY_FUNCTION 的设置为 ORA12C_STIG_VERIFY_FUNCTION，以下能成功修改用户密码的命令是哪个？（A） A alter user mytest identified by "1qaz#edc"; B alter user mytest identified by 1qaz#edc; C alter user mytest identified by '1qaz#edc';