Question $35(1$ point$)$

A hypothetical cell contains ion Z$-,$ which has an ionic equilibrium potential $($Ez$)$ of $+100$ mV $.$ At time $=0,$ the membrane is totally impermeable to all ions. At time $=1,$ the channels for Z $-($and no others $)$ open. Which of the following are true about the cell and ion Z $-?$

Shortly after time $=1,Vm=0mV$

At $t=0,Z-$ is more concentrated outside the cell than inside the cell.

At $t=0,Z-$ is more concentrated inside the cell than outside the cell.

At time $=1,Z-$ flows out of the cell down its concentration gradient.

At time $=1,Z-$ flows into the cell along its concentration gradient.

Shortly after time $=1,Vm=+100mV$