These wallets contain randomly generated private keys and are also called just a bunch of...

Non-Deterministic Wallets, also known as"Just a Bunch of Keys" (JBOK)wallets, contain randomly generated private keys that are not derived from a single seed. In this type of wallet, each key is created independently and must be backed up individually, as there is no way to recover keys through a mnemonic seed phrase.

Key Details:

Random Key Generation: Non-Deterministic wallets generate private keys independently, without a hierarchical or sequential structure. As a result, each key is standalone, and losing a key means losing access to the corresponding funds permanently.

Backup Requirements: Since each key is unique and unrelated, Non-Deterministic wallets require separate backups for each key. This differs from Hierarchical Deterministic wallets, which can be restored using a single seed phrase.

Use Case: These wallets were more common in the early days of cryptocurrency, but they are less favored today due to the convenience and recoverability provided by deterministic wallets.

In conclusion,C. Non-Deterministic Walletsis the correct answer, as it refers to wallets that contain randomly generated private keys and are known as JBOK wallets.