Which Statement(s) Describe an Undesirable Situation When Implementing SPC

Which statement(s) describe an undesirable situation when implementing SPC?  

A) The lower Control Limit for the R chart is equal to zero
B) Attempt to use SPC for tracking transaction times at a warehouse
C) A process is in Statistical Control before implementation of SPC
D) The Control Limits are wider than the customer specification limits

Correct Answer:

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