Out of ‘X’ pairs of ribs in humans only 'Y' pairs are true ribs. Select the option that correctly represents values of X and Y and provides their explanation:
1. | X=12, Y=5 True ribs are attached to vertebral column and sternum on the two ends. |
2. | X=24, Y=7 True ribs are dorsally attached to vertebral column but are free on ventral side. |
3. | X=24, Y=12 True ribs are dorsally attached to vertebral column but are free on ventral side. |
4. | X=12, Y=7 True ribs are attached dorsally to vertebral column and ventrally to the sternum. |
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