On June 1^st the Mega Marketing Research Firm sent out a mail survey to 5,000 potential customers of Mega's client company. The survey stated that everyone who completed the survey and mailed it back would receive a prize. Mega did not expect everyone to respond to the survey and had only 1,000 prizes on hand for the respondents. On July 14^th Sam mailed back his response and eagerly awaited his prize. On July 15^th Mega sent out the last prize it had. Sam's response arrived on July 16^th. It was the 1001^st and Mega wrote back telling Sam that unfortunately all the prizes were gone and he would not be able to have one.Has a valid contract been formed - discuss the elements that have been met