Choose Latest Date and Number of Month Criteria for Future Date

Hi all

I have been racking my brain on how to do this, or at least fit it into one formula. In the Table below, I want in column D to calculate a future date based on criteria and picking the latest date out of column A & B. The future date needs to be in either 24 or 15 months based on whether Column C shows 24 or 15. See below.

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So basically Column D (in the above example) would use Date 2 because it's the latest date and would calculate what the date would be in 24 months. However, if Date 1 was a later date for example 02/02/2017, it would ignore Date 2 and use Date 1 and if column C said 15 months it would calculate at 15 months instead of 24.

I hope this makes sense. Any help would be greatly appreciated.

Thanks all!