A portfolios value is $80 million and its beta is 0.90. The current stock index futures price is 1,200 and the multiplier is $250. To increase the beta of the portfolio to 1.10, ______ stock index futures contracts, and to decrease the beta of the portfolio to 0.60, ______ stock index futures contracts.

Select one:

a. buy 53, sell 80

b. buy 56, sell 80

c. sell 56, buy 90

d. sell 53, buy 90

e. sell 55, buy 100