Answer:
d) Must prevent workers from lubricating a machine without removing the safeguard
Step-by-step explanation:
As much as possible, the safeguard should allow safe lubrication. One should be able to service and lubricate the machine without having to remove the guard. Positioning the oil reservoirs far from the guard reduces the maintenance worker's need to go near the danger area.
Removing the safeguards before maintenance may increase the machine's danger, especially if the maintenance worker is a contractor.