Performing a penetration test against an environment with SCADA devices brings additional safety risk because the: 

Answer options:

A. devices produce more heat and consume more power.
B. devices are obsolete and are no longer available for replacement.
C. protocols are more difficult to understand.
D. devices may cause physical world effects.

C

Reference: https://www.hindawi.com/journals/scn/2018/3794603/