Final answer:
Capital letters with figures are used to refer to the vertebral column. The incorrect citation for the vertebral column is C6 for cardiac vertebra 6.
Step-by-step explanation:
Capital letters with figures are used to refer to the vertebral column. The correct citations for the vertebral column are:
a.S4 for sacral vertebra 4
b.T10 for thoracic vertebra 10
c.L3 for lumbar vertebra 3
d.C6 for cardiac vertebra 6 is not a correct citation because there is no cardiac vertebra in the vertebral column. Cardiac refers to the heart and is unrelated to the vertebral column.