What Is Correct in Regard to Seizing Electronic Devices

What is correct in regard to seizing electronic devices?

A) It is not necessary to have trained digital evidence experts direct how computers should be handled.
B) Seized cell phones should be turned off to preserve cell tower location information.
C) Seized cell phones should be left on so messages and calls of potential suspects could be received.
D) Electronic devices should be packed into plastic bags so one could see what the bag contains.