The is the space between the dura mater and the bone of the vertebra.

the space between the dura mater and the bone of the vertebra is the Epidural

Cumulus clouds are a bunch of low-lying clouds and they look like cauliflower. They are fair weather clouds. And therefore, on seeing them, I would continue lying on the beach. So, your answer is A. Cumulus clouds are puffy and are not sign of bad weather unless they are higher in the atmosphere.