The following table shows futures market data at the close of trading today. Expiry High Low Settlement Bid Ask Open 54.05 54.10 54.20 March 54.85 53.52 54.07 June 54.07 54.12 54.23 54.25 53.52 54.10 September | 56.08 56.13 54.50 57.85 55.25 56.10 December 55.25 55.30 56.10 56.56 54.21 55.27 For the June contract what price will be used to calculate the margin account balances? 54.50 57.85 O O O O 54.10 54.12