The personalistic styles of writing a research report are permissible in which of the following research?A. Grounded theory researchB. Experimental researchC. Participant-observation based researchD. Historical researchE. Case study researchChoose the correct answer from the option given below:

• A. A, B and C only
• B. B, C and D only
• C. C, D and E only
• D. A, C and E only