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Which parameter of the physical model is varied while measuring the input characteristics of a common-base transistor?

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Which parameter of the physical model is varied while measuring the input characteristics of a common-base transistor?

(a) Emitter current

(b) Emitter voltage

(c) Collector current

(d) Emitter base voltage

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Asked question is from Physical Model of a CB Transistor in chapter Small-Signal Low-Frequency AC models of Transistors of Electronic Devices & Circuits

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Correct choice is (d) Emitter base voltage

The explanation is: To determine the input characteristics, the collector-base voltage is kept constant at zero volts and the emitter base voltage is increased from zero volts to different voltage levels. For each voltage level of the input voltage, the input current is recorded.

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