Answer: LED have the lowest cost of operation.
Explanation:
If we ignore the initial procurement cost of the items the operational cost of any device consuming electricity is given by

Among the three item's LED consumes the lowest power to give the same level of brightness as compared to the other 2 item's thus LED's shall have the lowest operational cost.
Answer:
leggings
Explanation:
they allow the metal or sparks to not hurt you can the leggings can be easily and quickly removed.
I think it’s b sry if I’m wrong tho