Lateral Load Pile Calculation

For a 7m long concrete rectangular pile of 28cm * 15cm has young modulus of Elasticity 3*10^7 N/cm^2 .If unit Modules of subgrade reaction is 12 N/cm^ 2 .A load of 7000N is applied and corresponding deflection of 1.3cm occured then when of the following is correct For Depth of 3m.

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