I was looking at the last start codes on betfair form guide and I am not sure I know what they mean.

What is R/11 ? (Whats the R stand for ? Obviously 11 is the runners in the race)
What is C/11 ? (Whats the C stand for ? Obviously 11 is the runners in the race)

I assume F is failed to finish. I assume R is retired. But what is C ?

Example :

A particular horse:
http://form.horseracing.betfair.com...orse/1/00294736

A race:
http://form.horseracing.betfair.com...ork-IE-Cor/1250

In above example check the last 2 horses.

Also what is "o" ?