What is the total number of vertebrae in humans?

In the first two or three lumbar vertebrae,there is a small median process below the centrum; this is called:

Statement-$I$: Each rib is a thin flat bone connected dorsally to the vertebral column and ventrally to the sternum.
Statement-$II$: The $8^{th}$,$9^{th}$,and $10^{th}$ pairs of ribs do not articulate directly with the sternum but join the seventh rib with the help of hyaline cartilage. These are called floating ribs.

Select the correct option regarding the human rib cage.

$A$: Sella turcica is located in the skull,which lodges the pituitary gland.
$R$: It is a depression present in the sphenoid bone.

The $8^{th}$ and $9^{th}$ ribs are known as false ribs because their external portions are attached to