How many vertebrae fuse to form the coccyx in humans?

Which of the following statements is correct regarding certain parts of the human skeleton?

Which statement is correct for vertebrochondral ribs in human?

The backwardly projecting process of a neural arch in the case of lumbar vertebrae is known as:

Out of $X$ pairs of ribs in humans,only $Y$ pairs are true ribs. Select the option that correctly represents the values of $X$ and $Y$ and provides their explanation.

The transverse ligament is found in: