What is the correct order that Vault uses to protect data?

Comprehensive and Detailed in Depth Explanation:

Vault protects data using a layered encryption process:root key --> encryption key --> data. The HashiCorp Vault documentation explains: "The data stored by Vault is encrypted. Vault needs the encryption key to decrypt it. The key is also stored with the data (in the keyring), but it is encrypted with another key known as the root key. Therefore, to decrypt the data, Vault must decrypt the encryption key, which requires the root key." This sequence ensures data security through multiple encryption layers.

The docs further clarify: "Unsealing is the process of accessing this root key. The root key is stored alongside all Vault data but is encrypted by yet another mechanism: the unseal key. To recap: mostVault data is encrypted using the encryption key in the keyring; the keyring is encrypted by the root key; and the root key is encrypted by the unseal key." Option B includes unseal keys but omits the encryption key’s role. C and D misrepresent the order. Thus, A is correct.