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The variance-covariance approach, also known as the parametric approach, simplifies calculations by assuming that returns are normally distributed and by using the covariance matrix of asset returns to estimate portfolio risk. This approach provides significant computational advantages because it reduces the complexity involved in risk calculations. On the other hand, the full revaluation method (often used in Monte Carlo simulations) involves revaluing the entire portfolio under various simulated scenarios, which is computationally intensive. Thus, option A correctly identifies a key methodological difference.

Running trades through a clearinghouse provides several advantages for the small bank, including:

Eliminating the Collateral Requirement:

The clearinghouse nets positions and reduces the need for bilateral collateral postings.

Protecting Against Increases in Future Collateral Demands:

Centralized clearing reduces the potential for unexpected margin calls as prices fluctuate.

Protecting Against the Risk of the Failure of One of the Large Banks:

The clearinghouse acts as a central counterparty, reducing the impact if one large bank fails.

However, the clearinghouse does not specifically address option hedging risks or alter margin requirements directly related to options. Therefore, the correct answer is that running trades through a clearinghouse does not achieve the objective of mitigating option hedging risks and altering margin requirements.

ReferencesSource: How Finance Works​

Interest Expense on Deposits:

Deposits = $100 million, interest rate = 3%

Interest expense = $100 million * 0.03 = $3 million

Interest Income from Loans:

Loan portfolio = $120 million, interest rate = 10%

Interest income = $120 million * 0.10 = $12 million

Net Interest Income Calculation:

Net interest income = Interest income - Interest expense = $12 million - $3 million = $9 million

ReferencesSource: How Finance Works​

Floating rate bonds typically have a short duration because their interest payments reset periodically, aligning closely with current interest rates. This frequent resetting makes them less sensitive to changes in interest rates compared to fixed-rate bonds, which have a long duration and are more sensitive to interest rate fluctuations.