Why Should You Never Power on a Computer That You

Why should you never power on a computer that you need to acquire digital evidence from?

A) When the computer boots up, files are written to the computer rendering the data nclean
B) When the computer boots up, the system cache is cleared which could destroy evidence
C) When the computer boots up, data in the memory buffer is cleared which could destroy evidence
D) Powering on a computer has no affect when needing to acquire digital evidence from it