Left fielder Adam Dunn will be back with the Reds for at least one more season. The Reds on Wednesday exercised Dunn's $13 million option for 2008. Dunn, who turns 28 on Nov. 9, is eligible for free agency at the end of the season. The exercising of his option triggers a clause in his contract giving him full no-trade protection until June 15. After that, Dunn could be traded to 10 clubs, but the list would be of his own choosing.