Based on the comparison table:

Key Differences:

• Vasicek Model: One-factor model with normal distribution assumption, cannot capture hump-shaped volatility term structures, simple but less flexible
• Gauss+ Model: Three-factor model (with two sources of risk), assumes normal distributions for factors, can capture hump-shaped term structures of volatility, balances tractability

The correct answers are E and F because:

• E: Gauss+ Model being a three-factor model is a key distinguishing feature from the one-factor Vasicek model
• F: The ability to capture hump-shaped term structures of volatility is a significant advantage of the Gauss+ model over the Vasicek model

This comparison highlights how the Gauss+ model provides more flexibility in modeling interest rate dynamics, particularly in capturing more complex volatility patterns observed in real markets.