The diagram that effectively displays the construction of AB's perpendicular bisector would be:
a). Diagram 1
What is Perpendicular Bisector?
A Perpendicular bisector is described as a line that equally divides a line segment into two parts.
The construction is done by taking a point and drawing arcs on it from both sides taking each as center once.
This is done by employing a ruler along with a compass by making right angles on both sides.
Thus, option a is the correct answer.
Learn more about "Bisector" here:
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