The laplacian form of equation for anisotropic soil is ______

• A. \(\frac{∂^2 h}{∂x^2}+\frac{∂^2 h}{∂y^2}=0\)
• B. \(k_x \frac{∂^2 h}{∂x^2}+\frac{∂^2 h}{∂y^2}=0\)
• C. \(\frac{∂^2 h}{∂x^2}+k_y\frac{∂^2 h}{∂y^2}=0\)
• D. \(\frac{k_x}{k_y}\frac{∂^2 h}{∂x^2}+\frac{∂^2 h}{∂y^2}=0\)