Which statement below correctly describes how the channels that are active during the pacemaker potential are different from other ion channels used in action potentials?

• A. They are voltage gated.
• B. They are active over a much wider range of voltages than other ion channels.
• C. They allow Ca$^+$$^2$ ions to pass out of the cell.
• D. They allow both Na$^+$ and K$^+$ through the same channel.