In addition to being an important safety measure, proper grounding of a PLC system can:

A) lower installation costs.
B) increase the power efficiency of the system.
C) limit the effects of EMI.
D) assist in the operation of the MCR.

Proper grounding of a PLC system can limit the effects of EMI or electromagnetic interference. This is important because EMI can disrupt the signals being sent and received by the PLC, causing the system to malfunction or fail altogether. While proper grounding may not directly lower installation costs, increase power efficiency, or assist in the operation of the MCR, it is still a crucial step in ensuring the overall performance and reliability of the system.