It is July 1, 1990. Suppose the spot rates for the pound, mark, and Swiss franc are $1.30, $.35, and $.40, respectively. The associated 90-day interest rates (annualized) are 16%, 8%, and 4%, while the U.S. 90-day interest rate (annualized) is 12%. What is the 90-day forward rate on an ACU (ACU 1 = 1 + DM1 + SFr1) if interest parity holds? a) $2.0512 b) $2.1134 c) $2.0397 d) $2.0489