According to bilinear transformation method, the correct options in the following statements are (  )
A、As the name implies, bilinear transformation is a linear transformation that will cause a linear relationship between the edge frequency of the digital filter and the edge frequency of the analog prototype filter.
B、Bilinear transformation introduces a one-to-one mapping, as its name shows.
C、Although bilinear transformation has "linear" in it, it is actually a nonlinear transformation.
D、Bilinear transformation is a kind of multi-valued mapping, but it can guarantee the linear relationship between the edge frequency of the digital filter and the analog prototype filter.