Consider a divergent nozzle as shown in the figure. Let x, y be the coordinates in the physical domain and ξ, η be the coordinates in the computational domain. Which of these equations can give the best-suited grid for this system?

• A. ξ=x; η = y×ys
• B. ξ=x×ys; η=y×ys
• C. \(\xi=\frac{x}{y_s};\eta=\frac{y}{y_s}\)
• D. \(\xi=x;\eta=\frac{y}{y_s}\)