John is wondering how to reduce the costs incurred by his unit. He assembles a group of ten employees and asks them to meet in a room. John asks the employees to generate as many ideas as possible. He also advises everyone not to criticize others' ideas. For him, this session is intended to help generate as many ideas as possible. Which group decision making technique is John using? a. Brainstorming. b. Nominal group technique. c. Delphi technique. d. Focus group