The bones that start from the neck and extend back to the pelvic bones are called as:

The correct option is D Both (a) & (b)

Our spine consists of twenty-six vertebrae. Actually, there are 33 vertebrae in total, but the five sacral and four coccygeal vertebrae are fused together, so taken as one each. The upper twenty-four vertebrae are separated from each other by an intervertebral disc between them.

The upper twenty-four vertebrae are movable and rest are fused. Vertebrae of each region have unique structure and functions.