In the spring analogy of consolidation, cylinder is filled with water up to bottom of piston and spring carries 10 units of load. If external two units of load is applied and the valve is opened, then the effective pressure σ’ and hydrodynamic pressure u is given by ___________

• A. σ’=0, u=12
• B. σ’=10+∆σ’, u=2-∆σ’
• C. σ’=10, u=2
• D. σ’=12, u=0