From the Bulls press release:
The Chicago Bulls announced [Monday] the team has exercised its fourth-year option for the 2011-12 season for guard Derrick Rose and its third-year options for the 2011-12 season for forwards Taj Gibson and James Johnson. By exercising the respective player options, all three players will be under contract with the Bulls for the 2011-12 season.
The Bulls open the 2010-11 season on Wednesday against the Thunder in Oklahoma City.