to apostrophe or not the ending " 's" in plurals of abbreviations?

[vgv8]

How would be more correct to indicate plural "s" in the end of abbreviations in a (technical) article:
1a)
pro's and con's
1b)
pros and cons
1c)
pro and contras?
1d)
?

2a)
CMSs
2b)
CMS-es
2c)
CMS's
2d)

[vgv8]

I could not submit hyperlinks, now it is 5th post...
So, I am ending with beginning I cut to post...

I have read somewhere (probably in this site) that plurals of abbreviations, like
CMS (Content Management System) are better to denote by ending "s" but not " 's " (with perpending apostrophe), i.e. to write CMSs, but not CMS's or CMS-es because apostrophe indicates possession (by devil?).

What about "pro's and con's"?
I see it ubiquitously.Even more, top search (google) by "pro and
"pro's and con's" search gives 106 000 000 results
"pros and cons" search gives 21,700,000

[Rover_KE]

I would write

pros and cons

CMSs

Rover