Given the Following Notation, Which Design Is Illustrated $$\begin{array} { l l l } \mathrm { R } & \mathrm { X } _ { 1 } & \mathrm { O } \\\mathrm { R } & \mathrm { X } _ { 2 } & \mathrm { O }\end{array}$$

Multiple Choice

Given the following notation, which design is illustrated? $$\begin{array} { l l l } \mathrm { R } & \mathrm { X } _ { 1 } & \mathrm { O } \\\mathrm { R } & \mathrm { X } _ { 2 } & \mathrm { O }\end{array}$$

A) Pretest-posttest control group design
B) Posttest only control group design
C) Nonequivalent control group design
D) Static group comparison design