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| Which of the following is the expression for put-call parity (ct = call price, pt = put price, St = stock price (all at time t), X = exercise price of call and put, r = interest rate, T = time at expiration of the options)? A. St + pt = ct + Xe-r(T-t) B. St + ct = pt + Xe-r(T-t) C. St + pt = ct - Xe-r(T-t) D. St - pt = ct + Xe-r(T-t) |