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问题如下：

What does the "+" in the Gauss+ model indicate?

选项：

A.

The model includes a factor that is not a risk source.

B.

The model has three independent risk sources.

C.

The model assumes interest rates are log-normally distributed.

D.

The model is based on historical simulation.

解释：

The "+" indicates the existence of a factor or state variable that is not a risk source.