Which of the following statements are true? More than one answer may be correct - select all correct answers.
Select one or more:
a. A material that obeys Ohm's law reasonably well is called an ohmic conductor or a linear conductor.
b. The resistance of a conductor is proportional to the conductivity of the material of which the conductor is composed.
c. Semiconductors have resistivity values that are larger than those of insulators.
d. The resistance of a conductor is proportional to the resistivity of the material of which the conductor is composed.
e. Good conductors of electricity have larger conductivity values than insulators.
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