some time before the exercise date they will delist and you will get some paperwork to fill out and a time to have the rest of the money in by.. in this case for GDNO 30 June, with a bank or personal cheque usually.
currently these are a discount, plus you can keep the cash in the bank..
if you were buying today you could conceivably get GDN for 4c less than the market price, for a bit of admin work.
GDN Price at posting:
0.0¢ Sentiment: Buy Disclosure: Not Held