Stock Sale Question – What Type of Share To Sell

Hello,

I have a pair of long held stocks that have done well over time. For much of the time I've held them, dividends have been set to reinvest. I may be wrong, but I believe that this has created 2 categories of shares.

I may need to sell a portion of these stocks soon and am a bit confused as to which kind I should sell if I have to. One stock is on Computershare which separates them as “Certificated vs Plan”. The other is on Shareowneronline and when you get to the question “Please select the share type you want to sell” you are given the options of Plan, Direct Registration, or Direct Registration and Plan.

If I need to sell a portion of one or both of these stocks, which type of shares should I select?

Final bit of info: these stocks were purchased for me long ago by a relative so I don't have much more info on things beyond what I can see on the two website accounts referenced earlier.

Thanks for any advice or help.