Answer:
cross-sequential design
Step-by-step explanation:
Cross-sequential design -
This method of study uses both the cross-sectional design as well as the longitudinal design .
It refers to the type of study where comparison is done between two or more than two groups over a particular period of time , is referred to as cross - sequential design .
The method is beneficial to detect or analyse any error in the either of the design individually .
Hence , from the given information of the question ,
The correct answer is cross - sequential design .