A community weekly newspaper in Southern California in 1975 published the names of the parents of all children born in the community's three hospitals during the previous week

A community weekly newspaper in Southern California in 1975 published the names of the parents of all children born in the community's three hospitals during the previous week. For one year, a team of university researchers contacted the parents about participating in a study. If the parents agreed, they would provide data about themselves and the child once each year until 2015. Which of the following designs best fits this scenario? Explain your answer.

a. longitudinal

b. cross-sectional