Relief under section 89 of indian income tax

Hello,

In 2013 , I resigned from my company X in Feburary & my last day was 8th April 2014.

In April I had joined a new organisation Y

For the month of Feb & March 2013, my salary was not paid but was paid in full & final in May 2014.

Even though they had deducted my tax for the full year (i.e. including Feb & march) in 2013.

Since they paid my dues(arrears of Feb & ,Mrach salary) in May 2014.

Will this needs to be filed as 12 b section along with my New company Y salary & pay taxes by suming my 

Company X payment in May + Company Y salary.

or i can claim Company X payment under "Relief Under section 89 of Indian Income Tax" ?

Please guide.

Thanks 

Vineety