Answer: Option (a) is correct.
Explanation:
Correct Option: Panel data.
Panel data is a combination of cross sectional data and time series data. Panel data is mostly used for the regression analysis. In this type of data, one can observe multiple instances or scenarios at more than one time frame.
The information provided by this type of data can be categorized into parts:
(i) Cross-sectional Information
(ii) Time series Information