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How do we calculate the inverse hybrid-pi conductance in low frequency H-parameters g21 of a two-port network?

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How do we calculate the inverse hybrid-pi conductance in low frequency H-parameters g21 of a two-port network?

(a) g21 = I1 / I2

(b) g21 = I2 / I1

(c) g21 = V2 / V1

(d) g21 = V1 / V2

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Correct choice is (c) g21 = V2 / V1

To elaborate: The inverse hybrid-pi conductance in low frequency H-parameters g21 for a two-port network is calculated by open circuiting the output terminal. In this case, the current I2 is equal to zero. The parameter g21 is calculated by taking the ratio of output terminal voltage over input terminal voltage. It is also known as the open circuit voltage gain.

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