Which of the following spinning wheel gyro has an accuracy of 0.001 deg/hr?

Which of the following spinning wheel gyro has an accuracy of 0.001 deg/hr? Correct Answer Electrostatically suspended TDF gyro

In electrostatically suspended TDF gyro, the spinning wheel is suspended electrostatically hence reducing friction and achieving 0.001 deg/hr accuracy but at costs orders of magnitude higher than the floated TDF gyros.
Bissoy MCQ

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