निम्नलिखित में से किस दोलक (oscillator) की आवृत्ति स्थिरता और सटीकता सबसे अच्छी होती है?

Which of the following statements is true for a Colpitts oscillator?

Consider the following statements regarding an RC phase-shift oscillator using a single-stage common-emitter transistor amplifier: I. The amplifier gain is positive (no phase inversion) II. The amplifier gain is negative (introduces 180° phase shift) III. The phase shift introduced by the feedback network is 180° IV. The phase shift introduced by the feedback network is 360° Which of the statements are correct?