Two compartments are separated by a rigid semipermeable membrane (permeable to water only) at $300\mathrm{K}$: the left side holds $0.10\mathrm{M}$ $\mathrm{NaCl}$ (complete dissociation) and the right side holds $0.15\mathrm{M}$ glucose. Which of the following is/are correct? ($R=0.0821\mathrm{L}\mathrm{atm}\mathrm{mo}{\mathrm{l}}^{-1}{\mathrm{K}}^{-1}$)

1. AThe two solutions are isotonic, so there is no net flow.
2. BAn extra pressure of about $1.23\mathrm{atm}$ applied on the left side would just stop the net flow.
3. CIf the left compartment is open to a vertical tube, the liquid level there rises as equilibrium is approached.
4. DNet flow of water is from the right compartment to the left compartment.