In a resting neuron, the inside of the cell is

positive relative to the outside of the cell because the myelin sheath around the axon carries a negative charge

negative relative to the outside of the cell because of differences in ionic composition of the fluids inside and outside of the cell

positive relative to the outside of the cell because only positively charged ions are allowed into the cell

negative relative to the outside of the cell because the myelin sheath around the axon carries a positive charge