plural of PLC? Is it PLC's or PLCs?

[bunny3]

Title says it all. Just noticed PLC's (as in more than one PLC) written on dh's website and it looks wrong to me.
TIA

[georgimama]

Is wrong. An apostrophe either means a letter is missing (as in it's for it is) or denotes possession (Jane's coat). Plurals (see) don't have apostrophes (unless on greengrocer's stalls ).

[bunny3]

I thought as much.

Will send gloaty email to him now

[bunny3]

ooops Thank you!!

[georgimama]

You're welcome (am always scared of replying on pendants' corner as have to get grammar absolutely top notch and usually I don't on MN, even though I know it really)!