DX serial option settlement?

Does anyone know when/how DX options on futures settle? The ICE website is, as usual, sparse on details.

I have some long 75 calls expiring today... and it looks like it *might* get there.

https://www.theice.com/productguide/ProductDetails.shtml?specId=1216

 

Looks like the futures settle at 3 PM EST. So, I'm going to assume options are settled at the same time.

 

how do you buy calls and not know the settlement? couldn't that be dangerous?

 

Bought them as a currency hedge for broader portfolio. Don't usually trade them.