I NEED HELP NOW Owners of a radio station want to obtain information on the online radio listening habits in Spain. The station sends a survey out to those listeners with email addresses. Which of the following sampling designs best represents the type of survey design described? (4 points)

A cluster sample using the cities in clusters
A convenience sample from the entire country
A simple random sample from the entire country
A stratified sample from the entire country
An online poll that invites all people from the cities and towns in the market area to participate