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Under which exercise style may the option holder exercise the option only on the expiration date?

Byron buys one American call option contract with an April expiration on 100 shares of Intel common stock at a strike price of $22.50 per share from Selena, the option writer, for a premium of $0.95 per share. What has Selena just agreed to do?

Consider an American call option contract, with an April expiration month, on 100 shares of Intel common stock at a strike price of $35.00 per share. Suppose that Intel common stock currently is trading for $36.97 per share in the Nasdaq stock market. The premium is $4.83. What is the status of this option?

RSA-OAEP is a public-key encryption scheme based on RSA and the Optimal Asymmetric Encryption Padding (OAEP) method

Elena writes one American put option contract, with a May expiration month, on 100 shares of Intel common stock at a strike price of $40.00 per share. Suppose that Intel common stock currently is trading for $41.35 per share in the Nasdaq stock market. Elena collects a premium of $1.22. What is the greatest total dollar loss that Elena might experience on her option position? Ignore brokerage fees. Choose the best answer.

Early in the year, Scott buys an American call option on 100 shares of Exxon-Mobil common stock with a June expiration and a strike price of $20 per share. He pays a premium of $10.10. Exxon-Mobil common stock currently is trading for $27.05 per share. Assume that today is now the expiration date for the contract. What is the lowest price on Exxon-Mobil common stock at which Scott would exercise his call option? Assume the price increment at which the common stock trades is a penny, i.e., $0.01. Ignore brokerage fees.

Suppose that today is early January. Let’s consider one American call option contract, with an April expiration month, on 100 shares of Intel common stock at a strike price of $60.00 per share. Suppose that Intel common stock currently is trading for $57.32 per share in the Nasdaq Stock Market. Today, Byron buys one contract from Selena, the option writer, for a premium of $1.95 per share. Why would Byron buy a call option contract that gives him the right to buy Intel at $60.00 per share when the stock currently is priced at the lower price of $57.32 in the stock market? (Choose the best answer.)

Which of the following is/are true about the Diffie-Hellman key exchange protocol? (Select all that apply.)

Diffie-Hellman protocol can be used as a building block for efficient group key establishment.

In hash functions, collision resistant means that we cannot find any two different bitstrings so that they are mapped to the same hash value by using a hash function.