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How do we determine the value of the hybrid parameter h21 in a two – port network?

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How do we determine the value of the hybrid parameter h21 in a two – port network?

(a) h21 = I1 / I2

(b) h21 = V1 / V2

(c) h21 = I2 / I1

(d) h21 = V2 / V1

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I need to ask this question from Determination of the H-Parameters in division Small-Signal Low-Frequency AC models of Transistors of Electronic Devices & Circuits

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Right choice is (c) h21 = I2 / I1

To explain I would say: To calculate the value of h21, we short circuit the output terminal so the output voltage V2 equals zero. Hence the equation for hybrid parameters becomes, I2 = h21I1 + 0. Therefore, h21 = I2 / I1.

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