The correct answer is A.

The CIO had been valuing credit derivatives by marking them at or near the midpoint price in the daily range of prices. This method is also known as marking to market. The midpoint price is the average of the highest and lowest prices that a security reaches within a day, which is considered to be the most representative of fair value. By using this method, the CIO was able to provide a more accurate and fair valuation of the credit derivatives. This method is commonly used in the financial markets to ensure that the valuation of securities is reflective of the current market conditions.

Choice B is incorrect. The CIO was not marking the credit derivatives above the midpoint price in the daily range of prices. This would have resulted in overvaluation of these derivatives, which is not consistent with standard financial risk management practices.

Choice C is incorrect. The CIO was also not marking them below the midpoint price in the daily range of prices. This would have led to undervaluation of these derivatives, which again contradicts standard financial risk management practices.

Choice D is incorrect. The CIO did not mark them at prices that were at significant variance to the midpoints of dealer quotes in the market until they devised a new valuation system to obscure losses. Prior to this, they had been marking them at or near the midpoint price in the daily range of prices as per standard practice.

Things to Remember

• Marking to market is a common practice in financial markets where assets are valued based on their current market price.
• Valuing credit derivatives at or near the midpoint price in the daily range of prices helps in providing a fair and accurate valuation.
• Concealing losses through improper valuation methods can lead to significant financial risks for the organization.
• Transparency and accuracy in valuation methods are crucial for effective risk management in financial institutions.