以下可以正确获取结果集的有( )。 A. Statement stat=con.createStatement(); ResultSet rs=stat.executeQuery(“select * from book”); B. Statement stat=con.createStatement(“select * from book”); ResultSet rs=stat.executeQuery(); C. PreparedStatement pstat=con.preparedStatement(); ResultSet rs=pstat.executeQuery(“select * from book”); D. PreparedStatement pstat=con.preparedStatement(“select * from book”); ResultSet rs=pstat.executeQuery();