Gary owns a tax preparation business. Which is a sign that his client data may have been stolen? A. A client requested a tax return transcript on the IRS website and never received it. She can't remember if her new address is on file. B. Several clients had ttheir returns rejected because their social security number had already been used. C. Gary received a phone call from someone claiming to be their internet service provider, asking to their login information. D. Three clints with scheduled appointment didn't show up on the same day