Barkhausen Criterion for sustained oscillations in a feedback oscillator states that loop gain |A*beta| and total phase shift must be:
A|A*beta| > 10 and phase shift = 90 degrees
B|A*beta| = 0 and phase shift = 45 degrees
C|A*beta| < 1 and phase shift = 180 degrees
D|A*beta| = 1 and phase shift = 0 or 360 degrees
Explanation
For sustained sinusoidal oscillation, magnitude of open loop gain |A*beta| must equal 1 and total loop phase shift must be an integer multiple of 360°.
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