Is It ‘CdA’ Or ‘CDA’ Or ‘Cd’A’?

I’ve lived in Coeur d’Alene for more than 30 years — and I’m still not sure which abbreviation best suits this wonderful community of mine — “CdA” or “CDA” or “Cd’A.” For awhile, I posted the shorthand on HucksOnline as “CDA” because it was easier to type. You have to remember the down stroke on the “d” when using “CdA.” I suspect that “Cd’A” is the least favorite choice. What do you think?

Question: Is it “CdA” or “CDA” or “Cd’A”? And is there any way that we can all settle on one choice?