Final answer:
The separation required between network communication cable and power cables is at least 5 times the cable diameter. The correct answer is option c. 5.
Step-by-step explanation:
The separation required between network communication cable and power cables depends on the type of cables involved. Generally, it is recommended to have a separation of at least 5 times the cable diameter between network communication cable and power cables.
This is to minimize electromagnetic interference (EMI) and reduce the risk of signal degradation. For example, if the diameter of the power cable is 10mm, a separation of at least 50mm (5 times the diameter) would be required. Therefore, the correct answer is option c. 5.