In January 2007, TJX disclosed that hackers had breached its credit card systems. The company reported that the attackers might have accessed credit card data going back to 2002. It reported that 45.7 million credit and debit card numbers might have been disclosed. At the time, the breach was believed to be the largest ever. Banks and customers sued TJX in connection with the breach. State governments also sued the company for failing to protect the credit card information of state residents. Given the nature of this breach, which federal agency opened an investigation?