a. Explain how to create a synthetic portfolio to replicate a stock using Put-Call Parity. (1 mark) b. Use equations and symbols to derive the net investment for this synthetic portfolio at initiation (Date 0). (2 marks) c. Use equations and symbols to derive the net positions of the portfolio at expiration (Date T) if (1) ST < X; (2) ST > X. d. What are the two practical implications of the Put-Call parity results? (4 marks) (6 marks)