The correct option is d. Grounded bus.
The following information should be considered:
- For the balanced loads, there should be the zero current.
- But for the unbalanced one there should be the current in the neutral wire.
- So connecting neutral to the ground in subpanel will permit the current and due to this there should be the risk of shocks.
- For preventing this, neutral bus should be completely isolated from the grounded bus.
Learn more: brainly.com/question/17429689
