What is the best option to upgrade oracle 9i to 10g with standby?

I have a production DB with standby on 9.2.0.6. We plan to upgrade it to 10.2.0.4. The database is about 500GB. The network between primary and DR is limited at 10m bit/second. Primary is at Atlanta and DR is at Virginia.
The choices are, I think, that I can do an upgrade at primary and send the db copy to DR to build the standby db (this may take a whole day at least). Or I can upgrade primary to 10g. At same time bring the standby to normal database to upgrade to 10g and then bring it back to DR mode (can I do this technically?).
What is the best in term of minimum down time? Or do we have any other choices? Thanks.

Hi
Thanks a lot for prompt reply! My understanding is that you recommend option1:
Option1 (in my understanding way):
0. Stop both application and standby database
1. upgrade primary to 10g
2. Re-start application to point primary on 10g
3. Take a backup (eiterh rman or manual hot) - this could take while 3-4 hours
4. Send backup to standby site - this will be while 6-8 hours
5. Create a standby control file from primary to send over to standby
6. Create and start standby DB and let it apply all logs generated during the priod of step 2,3,4,5. (this could be while as the database is very active)
I thought possible option2:
Option2:
0. Stop application, primary, and stadby databases.
1. Upgrade primary to 10g. At same time, activate the standby to normal db and upgrade it to 10g. At end of the step, hopefull, both primary and standby is still in sync.
2. Re-start the application to point primary on 10g
2. Create a standby control file from primary to send over to standby
3. Create and start stadnby DB and let it apply all logs generated during the period of step 2.
It looks that option2 will be taking shorter time overall as no duplication needed. Would that be possible technically and practically?
Thanks for any advice!

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