主题：帮看看：这些筛选条件都正确吗？

根据三列来筛选：列名：posted（逻辑列），Year和Period（数字列）。
条件是：posted为“是”，同时年月小于或等于2013年8月的记录。

下面的写法有错误的吗？？？或者，那个绝对正确！？
1、posted <> 0 and Year < 2013 Or (Year = 2013 And Period <= 8)
2、posted <> 0 and (Year < 2013 Or (Year = 2013 And Period <= 8))
3、posted <> 0 and (Year < 2013 Or Year = 2013 And Period <= 8)
4、(posted <> 0 and Year < 2013) Or (Year = 2013 And Period <= 8)
5、posted <> 0 and Year < 2013 Or (posted <> 0 and Year = 2013 And Period <= 8)
6、posted <> 0 and Year < 2013 Or posted <> 0 and Year = 2013 And Period <= 8