To put on this September 40 - 50 long strangle, you:

a) buy the 40 call and sell the 50 put.
b) sell the 40 call and buy the 50 put.
c) buy the 50 call and buy the 40 put.
d) sell the 40 call and sell the 50 put.
e) sell the 50 call and sell the 40 put.