Correct Answer:
C. Both A and B
Explanation:
Longitudinal survey studies can be classified as both trend surveys and cohort surveys, and panel surveys:
Trend surveys: A type of longitudinal survey that studies trends over time
Cohort surveys: A type of longitudinal survey that samples a group of people who share a common characteristic, such as birth or graduation
Panel surveys: A type of longitudinal survey that follows a smaller group of people over time
Longitudinal studies can be either prospective or retrospective in nature. They can be expensive and time-consuming, as it can take a long time to collect and analyze the data.
Trend surveys: A type of longitudinal survey that studies trends over time
Cohort surveys: A type of longitudinal survey that samples a group of people who share a common characteristic, such as birth or graduation
Panel surveys: A type of longitudinal survey that follows a smaller group of people over time
Longitudinal studies can be either prospective or retrospective in nature. They can be expensive and time-consuming, as it can take a long time to collect and analyze the data.