how to spell colleague plural

BizWritingTip response: If you want to make capital letters and abbreviations ending in a capital letter plural , it is best to just add a lowercase s*
The only time I would use an apostrophe with an abbreviation is if possession was involved.

Q. My colleagues and I are debating a grammar issue. We read the grammar rules, but we are still unclear. Here is the sentence: “Your employees are the business’s most valuable assets.” Business is singular but it could be interpreted as plural. Which of the following is correct?
Your employees are the business’ most valuable assets.

References:

http://www.chicagomanualofstyle.org/qanda/data/faq/topics/PossessivesandAttributives/faq0038.html
http://www.isplural.com/plural_singular/colleague