Vasicek's Model is the appropriate methodology to be associated with regulatory capital calculation under Basel II standards. It applies a one-factor Gaussian copula model to estimate the probability of default over a specified time horizon, making it suitable for Credit VaR calculations for regulatory requirements.

A is incorrect. A multifactor Gaussian copula model focusing on time-until-recovery is not typically associated with regulatory capital calculation for Credit VaR, as time-to-default is the primary concern.

C is incorrect. Credit Risk Plus does not use variance-covariance approaches; instead, it adopts procedures akin to insurance for calculating expected and unexpected losses from defaults, tailored for credit risk and not market fluctuations.

D is incorrect. Historical simulation for Credit VaR should involve the use of transition matrices and consider credit correlations, as these are critical for capturing the nature of credit risk.

Things to Remember

• Vasicek's Model is a fundamental tool in the calculation of Credit VaR for meeting regulatory capital requirements under Basel II standards.
• Understanding the appropriate methodologies for Credit VaR calculation is essential for compliance with banking regulations and effective risk management.
• The selection of methodologies for Credit VaR calculation should reflect the unique characteristics and requirements of the credit risk being assessed.
• Recognizing the differences between tools for market risk and credit risk measurement helps avoid the application of inappropriate models that can lead to noncompliance or inadequate risk assessment.