6. The exercise price, X2, you have a short position in, thus you wrote this option receiving c2.
7. Important that to remember that a call option with a lower exercise price is more expensive than a call option with a higher exercise price, therefore you pay more for the long call than you receive for the short call.
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12. The exercise price, X2, you have a long position in, thus you bought this option paying p2.
13. Important that to remember that a put option with a higher exercise price is more expensive than a put option with a lower exercise price, therefore you pay more for the short put than you receive for the long put.