The graph illustrates the $I$-$V$ characteristic of a semiconductor diode. Which statement can be deduced from the graph?
- AAbove a certain positive potential difference the diode obeys Ohm’s law.
- BCurrent is directly proportional to potential difference when the current in the diode is in one direction.
- CThe diode has zero resistance when the current in the diode is in one direction.
- DThe resistance of the diode depends upon the potential difference across it.