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In each plot below, the data is projected onto two (unit-length) principal component vectors. We say that a plot is "valid" if the $x$-coordinate (written as "PC1") would be the first chosen principal coordinate and the $y$-coordinate (written as "PC2") would be the second chosen principal coordinate. Which plots are valid ?

  1. A
  2. B
  3. C
  4. D

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