Which of the following are types of case studies?
(a) Observational
(b) Historical
(c) Dimensional
(d) Situational
(e) Experimental
Choose the correct answer from the options given below:
1
(a), (b), (e) only
2
(c), (d), (e) only
3
(b), (c), (d) only
4
(a), (b), (d) only