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In the given block diagram of an op-amp. What are A, B, C and D?

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In the given block diagram of an op-amp. What are A, B, C and D?

(a) A = Dual input and balanced output differential amplifier, B = Dual input and unbalanced output differential amplifier, C = Level shifter, D = Power amplifier

(b) A = Dual input and balanced output differential amplifier, B = Dual input and balanced output differential amplifier, C = Dual input and unbalanced output differential amplifier, D = Normal amplifier

(c) A = Dual input and unbalanced output differential amplifier, B = Dual input and balanced output differential amplifier, C = Voltage regulator, D = Power amplifier

(d) A = Normal amplifier, B = Dual input and unbalanced output differential amplifier, C = Level shifter, D = Dual input and balanced output differential amplifier

The question was posed to me in an interview.

This intriguing question comes from Operational Amplifiers topic in chapter Op-amps and its Applications of Analog Circuits

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Correct answer is (a) A = Dual input and balanced output differential amplifier, B = Dual input and unbalanced output differential amplifier, C = Level shifter, D = Power amplifier

The best I can explain: The correct block diagram is

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