In the figure four plate characteristics of a triode at different grid voltage are shown. The difference between successive grid voltage is $1\ V.$ Which curve will have maximum grid voltage and what is its value?
A$A, V=+4 V$
B$B, V=+4 V$
C$A, V=0$
D$D, V=0$
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D$D, V=0$
Grid is maintained between $0$ volt to certain negative voltage.
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