Boston Inc stock is currently valued at $39. An investor buys a single call option on the stock with a strike price of $40 and sells a single call option on the stock with a strike price of $42.50. The market prices of the options are $2.75 for the bought call option and $1.50 for the written call. The options have the same maturity date. Indicate what type of option trading strategy is, the minimum profit, and maximum profit. Draw a diagram to demonstrate this.