Which of the following statements are incorrect based on the required elements of a research design?

A. An effective research design does not require a clear purpose or aim of the research.

B. The tools selected for the collection of data should be clearly informed.

C. The settings for the research study do not need to be clear or well-informed to the researcher.

D. The researcher should have a clear idea of the tentative timeline required for the overall research.

E. Knowing the measurement of analysis in advance is not necessary for a research design.

F. The limitations and ethical guidelines of the selected research should be clearly known to the researcher.

Choose the correct answer from the options given below: