The correct answer is b) transverse plane.
The transverse plane, also known as the horizontal plane, divides the body into superior (upper) and inferior (lower) parts. This plane runs perpendicular to both the sagittal and frontal planes. In contrast, the sagittal plane divides the body into left and right portions, while the frontal plane separates it into anterior (front) and posterior (back) sections. Understanding these anatomical planes is crucial for describing the locations of structures and movements in the body.