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Which of the following statement is incorrect? (a)Output of CE amplifier is out of phase with respect to its input

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Which of the following statement is incorrect?

(a) Output of CE amplifier is out of phase with respect to its input

(b) CC amplifier is a voltage buffer

(c) CB amplifier is a voltage buffer

(d) CE amplifier is used as an audio (low frequency) amplifier

This question was posed to me in class test.

I'm obligated to ask this question of Hybrid Equivalent Model in division Transistor Biasing and Low Frequencies of Analog Circuits

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Right answer is (c) CB amplifier is a voltage buffer

The best I can explain: The output of the CE amplifier has a phase shift of 180^o with respect to the input. The CC amplifier has AV≅1, thus it is a voltage buffer. However, the CB amplifier has a large voltage gain, and its current gain AI≅1, thus it is a current buffer. CE amplifier has an application that has an audio amplifier.

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