9. 某線性二埠 (two ports) 電路以阻抗參數表示時為 \(V_1 = Z_{11}I_1 + Z_{12}I_2\) 與 \(V_2 = Z_{21}I_1 + Z_{22}I_2\)，若該二埠電路為互易 (reciprocal)，則下列何者為真？
(A) \(Z_{11} = Z_{12}\)
(B) \(Z_{11} = Z_{21}\)
(C) \(Z_{12} = Z_{21}\)
(D) \(Z_{22} = Z_{11}\)

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