Which of the following is NOT listed as a common posture variation?

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The question is about identifying the posture patterns that are commonly described in the sagittal plane of the spine and pelvis. The typical variations include kyphotic-lordotic, which combines increased thoracic kyphosis with increased lumbar lordosis; flat back (military spine), which shows reduced lumbar lordosis and often a posterior pelvic tilt; and sway back, where the pelvis shifts posteriorly and the thoracic region rounds with a flattened lumbar curve. Rounded shoulders, while a real and common postural issue, is a shoulder girdle/upper-body posture pattern rather than one of the classic spinal sagittal variations. It can occur with various spine alignments but isn’t categorized as a primary common spinal variation like the other three. So rounded shoulders is the one that isn’t listed as a common spinal posture variation.