Martin, a Certified Fraud Examiner, is examining the quick ratio of the ABC Company. He notes that ABC has cash of $500,000, marketable securities of $1 million, receivables of $3 million, and inventory of $7 million. ABC's current liabilities are $2.25 million. What is ABC's quick ratio? Select one: a. 2:1 b. None of the choices C. 5:1