Please select the wrong option in the following two forms of the data reduction.
选项：

A:Feature reduction is a reduction of the attributes of a dataset, the purpose of which is to obtain a reduction representation of a representative number of data columns.;
B:PCA is an important feature reduction method.;
C:Boxplots are often used to implement value reductions.;
D:Sampling is a common method of value reduction. Common sampling methods include random sampling, cluster sampling and stratified sampling.