aex or aexo?

Recently one of you posted an excellent explanation of how options work re. AEXO but I can't find it again. If you know what I'm talking about and can repost it I'd really appreciate it.

Prob a bit of volatility ahead for the market in general. AEX seems an excellent prospect. Much better than most OZ stocks, recent talk of over-riding non-U mining states notwithstanding. Not sure if AEXO worth a go as well and at what price.