Which of the Following Can Be Symbolized As

Multiple Choice

Which of the following can be symbolized as:
EG: R    X     O1
CG: R    O2
Where,
X = the exposure of a group to an independent variable, treatment, event, the effects of which are to be determined
O = the process of observation or measurement of the dependent variable on the test units or group of units
R = the random assignment of test units or groups to separate treatments
CG = control group EG = experimental group

A) one-shot case study
B) one-group pretest-posttest design
C) posttest-only control group design
D) static group design
E) Pretest-posttest control group design