A metal alloy machine component is subjected to fluctuating tensile stress from 100 N/mm² to 200 N/mm². The material has yield and endurance strength of 450 and 200 N/mm² respectively. Find the factor of safety of the machine component.
- A. 5/6
- B. 12/7
- C. 1/3
- D. 6/5
Answer: B. 12/7