What Does the Following Figure Represent A) Simple Interrupted Time-Series Design
B) Interrupted Time Series with \mathrm{O}_{2}

What does the following figure represent?
$\begin{array}{llllllll}\mathrm{R} & \mathrm{O}_{1} & \mathrm{O}_{2} & \mathrm{O}_{3} & \mathrm{X} & \mathrm{O}_{4} & \mathrm{O}_{5} & \mathrm{O}_{6} \\\mathrm{R} & \mathrm{O}_{1} & \mathrm{O}_{2} & \mathrm{O}_{3} & & \mathrm{O}_{4} & \mathrm{O}_{5} & \mathrm{O}_{6}\end{array}$

A) Simple interrupted time-series design
B) Interrupted time series with nonequivalent comparison group
C) Simple interrupted time series with equivalent comparison group
D) Factorial design