Which diode is in forward bias?

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(C) $PN$ junction diode is in forward bias when the potential at the $P$-terminal (anode) is higher than the potential at the $N$-terminal (cathode).I

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(C) $PN$ junction diode is in forward bias when the potential at the $P$-terminal (anode) is higher than the potential at the $N$-terminal (cathode).In the given options:$(A)$ $P$-terminal = $-4 \ V$,$N$-terminal = $-3 \ V$. Since $-4 \ V $(B)$ $P$-terminal = $3 \ V$,$N$-terminal = $3 \ V$. Potential difference is $0 \ V$,so it is not forward biased.$(C)$ $P$-terminal = $0 \ V$,$N$-terminal = $-2 \ V$. Since $0 \ V > -2 \ V$,it is forward biased.$(D)$ $P$-terminal = $-2 \ V$,$N$-terminal = $2 \ V$. Since $-2 \ V Therefore,the correct option is $(C)$.

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