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:
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Answer:
Indicators for ineffective system engineering are as follows
1.Requirement trends
2.System definition change backlog trends
3.interface trends
4.Requirement validation trends
5.Requirement verification trends
6.Work product approval trends
7.Review action closure trends
8.Risk exposure trends
9.Risk handling trends
10.Technology maturity trends
11.Technical measurement trends
12.System engineering skills trends
13.Process compliance trends