Three put options on a stock have the same expiration date and strike prices of $50, $55, and $60. The market prices are $3, $5, and $8, respectively. How a butterfly spread can be created?

Select one:

a.

by buying the $50 put, buying the $55 put and selling two of the $60 puts

b.

by buying the $50 put, buying the $60 put and selling two of the $55 puts

c.

by buying the $55 put, and selling two of the $50 puts

d.

by selling the $50 put, selling the $60 put and buying two of the $55 puts