Rectification form for fy 2017-18

Dear All Members

I have filled ITR for FY 2017-18 but forgot/skipped to take relief under section 89. By going through thread on this form I came to know that the same can be resubmitted via. rectification form.

1. My question is what needs to be selected while filling Request Type :

a) Tax Credit Mismatch     b) Return Data Correction(XML)     c)Only Response for return   d)additional info for 234C

2. Can I fill the ITR for this year i.e. FY 2018-19 just thereafter ? or should i wait for 1-2 days ?

P.S. 1. I have filed the ITR under 139(before due date).

        2. I have received the arrear in FY 2018-19 so need to revise the last year salary.

Thanks in advance for your valuable inputs