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

Multiple Choice

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

A) One-group posttest-only design
B) One group pretest-posttest design
C) Posttest only control group design
D) Posttest-only design with nonequivalent groups