Use This Figure to Answer the Corresponding Questions

Use this figure to answer the corresponding questions.
Identify the location(s) where the cell's permeability to Na⁺ is the greatest.
$\begin{array}{ll}\text { a. } & \text { between } 1 \text { and } 2 \\\text { b. } & \text { between } 2 \text { and } 3 \\\text { c. } & \text { between } 2 \text { and } 4 \\\text { d. } & \text { between } 3 \text { and } 4\\\text { e. } &4 \text { only }\end{array}$