A system has the following series-reliability block diagram: Failure rates are: AC Power = 0.002 failures per

A system has the following series-reliability block diagram:

Failure rates are:
λAC Power = 0.002 failures per year λDC Power Supply = 0.004 failures per year λLevel Switch = 0.02 failures per year λTime Delay Relay = 0.025 failures per year λSolenoid = 0.08 failures per year What is the failure rate of the system in failures per year?

A. 0.131 B. 0.125 C. 0.129 D. 3.2 E-10 E. 0.869

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AC Power DC Power Level Time Delay Solenoid Supply Switch Relay