Which of the following types of keys is found in a key escrow?

Public keys are meant to be freely distributed and publicly known, making their escrow unnecessary as they do not require recovery or restricted access.

Key escrow specifically involves storing a copy of an entity's private key with a trusted third party. This allows the key to be recovered in case the original is lost, corrupted, or if authorized parties (like legal authorities) need access to encrypted data for forensic or compliance reasons.

Shared keys (symmetric keys) are typically managed within the communicating parties and while they need secure storage, 'key escrow' as a term is most commonly associated with the secure, recoverable storage of asymmetric private keys.

Session keys are temporary, ephemeral keys used only for the duration of a single communication session, making their long-term storage or escrow illogical and unnecessary.