Which of the following situations in a neuron results in action potentials that have extended depolarization phases?

A) Inhibiting the voltage-gated Na⁺ channels.
B) Stimulating the voltage-gated K⁺ channels.
C) Compromising the inactivation mechanism in voltage-gated Na⁺ channels.
D) Compromising the inactivation mechanism in voltage-gated K⁺ channels.
E) None of the above.