John would like to conduct a survey in his neighborhood to get homeowners' opinion on Delmarva proposal to switch to natural gas. Which of the following is an example of a stratified sample?

• John randomly chooses three streets and selects every third house on those streets.
• John selects the first 25 homes that he passes as he walks into the entrance of the development.
• John selects every third house on each street.
• John divides the population into two-story, split-level, and ranch houses. Then, he selects a proportional amount of houses from each group.