4. (Stochastic volatility) Write a MATLAB program to observe the implied volatility smile for the option based on the stock price having stochastic volatility. Use the following data for the calculation.

Sð0Þ 5 100;K 5 100; T 5 0:5; r 5 8%; σ 5 30%; σσ 5 10%;rσ 5 10%

Plot the graph of the estimated implied volatility against the moneyness of the option.