Plays Well With Others...
E-mail me at: longhorntwice -at- hotmail -dot- com... All writings and photographs on this blog are my work. Give credit where credit is due.I believe the answer to be... both.
The apostrophe would apply, because the terms are acually acronyms. More correct would be C.D.'s. But who has the time, really?
Which leads me to the complete opposite argument. Because we don't puncutate the acronyms, it is possible to argue that CD has become a term used in American english, and therefore no apostrophe is needed.
I agree, possession would be the decider for me, except for the fact that a style book says it's ok...I need to find my style books from school and see what they say. I guess this is how language changes.