Which of the following statements about PCA are correct? (Note that there can be more than one correct statement.) Select one or more: O a. The objective of the ERM problem for PCA is not a convex...

Extracted text: Which of the following statements about PCA are correct? (Note that there can be more than one correct statement.) Select one or more: O a. The objective of the ERM problem for PCA is not a convex function. O b. PCA is used for clustering. O C. PCA applies a non-linear encoder and a linear decoder.