Epidemiologists Tried to Investigate the Role of Factor Z in the Exposure-Disease

Epidemiologists tried to investigate the role of factor Z in the exposure-disease relationship.They developed three tables to show the exposure-disease relationship based on the status of factor Z.Based on the information given,what is the role of factor Z in the exposure-disease relationship?Overall
$\begin{array}{|l|l|l|} \hline& \text { Case } & \text { Control } \\\hline \text { Exposed } & 1,050 & 500 \\\hline \text { Unexposed } & 300 & 700 \\\hline\end{array}$

Factor X present
$\begin{array}{|l|l|l|}\hline & \text { Case } & \text { Control } \\\hline \text { Exposed } & 700 & 250 \\\hline \text { Unexposed } & 200 & 350 \\\hline\end{array}$

Factor X absent
$\begin{array}{|l|l|l|}\hline & \text { Case } & \text { Control } \\\hline \text { Exposed } & 350 & 250 \\\hline \text { Unexposed } & 100 & 350 \\\hline\end{array}$

A) Factor Z is a confounder.
B) Factor Z is an effect measure modifier.
C) Factor Z is a mediator.
D) Factor Z is an outcome.
E) Factor Z does not have any role in the exposure-disease relationship.