Each of the Following Is a Voltage-Gated Na⁺ Channel Property

Each of the following is a voltage-gated Na⁺ channel property except

A) opens rapidly when stimulated.
B) closes rapidly in absence of stimulus.
C) opens to a variable extent depending on how much the stimulus voltage exceeds the threshold voltage.
D) has a voltage sensor helix that controls channel gating.
E) can be inactivated by the inactivating particle part of the channel protein.