Assume today is Dec 10, 2020. Options on the stock of Pfizer Inc are on a March cycle. The current stock price of Pfizer Inc is $42/share. An American call on Pfizer Incs stock with strike price of $50 is available for $2.3. The American call will expire in 7 months. Assume each call gives the buyer of the call the right to purchase 100 shares of stocks.

1. (a) With what expiration months are options on Pfizer Incs stock are traded now? (4 points)
2. (b) An investor wants to buy 10 of this American call for cash. What is the margin requirement for his purchase ? ( 2 points)
3. (c) An investor wants to write 10 of this American call. What is the margin requirement for his sale of the American call ? ( 4 points)