12. Two silicon diodes, with a forward voltage drop of 0.7 V, are used in the circuit shown in the figure. The range of input voltage Vi for which the output voltage  V0=Vi  , is

(A) -0.3 V < Vi < 1.3 V

(B) -0.3 V < Vi < 2 V

(c) -1.0 V < Vi < 2.0 V

(D) -1.7 V < Vi < 2.7 V


Answer-(D) -1.7 V < Vi < 2.7 V
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