A failure rate report states that a level transmitter did not indicate high level in a storage tank. Proof testing performed each year did not detect the failure. The failure was traced to a failed capacitor that shifted the vibration frequency of the sensing element. Which of the following is true?

A. The failure should be classified as random and counted in the failure rate analysis. Since the failure was counted, no further action is necessary.

B. The failure is counted in the failure rate analysis, but the report indicates that a systematic improvement is required in the proof test procedure for the device.

C. The failure is systematic and should not be counted as a random failure. The proof test procedure must be improved.