answer these questions please, it is from derivative module

Question 11 (a) Give three reasons why a hedger or investor might buy forwards instead of futures or vice versa? (b) A one-year long forward contract on a non-dividend-paying stock is entered into when the stock price is 80 and the risk-free rate of interest is 1% per annum with continuous compounding. (i) What are the forward price and the initial value of the forward contract? (ii) Six months later, the price of the stock is 690 and the risk-free interest rate is still 1%. What are the forward price and the value of the forward contract? (c) The two-month interest rates in Switzerland and the United States are 3\% and 1% per annum, respectively, with continuous compounding. The spot price of the Swiss franc is $0.8000. The futures price for a contract deliverable in two months is $0.8100. Does this create an arbitrage opportunity? (d) What is basis risk? Explain how an oil producer might hedge their future price exposure using futures and in particular how to minimize basis risk. In April 2020 WTI (oil) future prices for the June delivery went negative. Based on factors that affect future prices discuss how this might have happened, how it might impact on basis risk and the possible impact on oil producers who hedged their future income using futures