Deductions & credits

Thanks for the document. I read through all the three options.

If I choose option 3, then it gives highest reportable W2 wages. 

 

Does it mean I will have to correct my W2 as well and report the box 12 wages reprorted under code D, added back to taxable witholding wages?

 

In other words, I can get QBID on my 401k contribution but I have to loose tax deferal on those. Its one or other. Is it true understanding?

 

Also any amount eported inder Box 12 , W and DD are not counted as wages for QBID purpose. Is that correct understanding as well?