Supposing that a portfolio is consisted of a purchase position in a sell right with exercising price 35 euros and sell position in a sell right with an exercising price of 40 euros. Both rights have the same duration. If at the maturity the price of the underlying title is 30 euros which is the price or loss of the portfolio? (in your calculations take into consideration the cost of revenue of the rights). Calculate and choose one of the following:

a. 5 euros

b. - 5 euros

c. 10 euros

d. - 10 euros