The transaction of Electro Corp. selling their stock to an investment banking firm means that this happened in the Primary market.
This is the market where a company issues its stock to the market. They can issue it directly, but they usually go through an investment banking firm.
This investment banking firm would buy the stock at a lower price and then sell it to the market at a higher price.
Find out more on the primary stock market at https://brainly.com/question/17168396.
#SPJ12