Which of the following is a requirement when implementing PKI if data loss is unacceptable?

A.
Web of trust

B.
Non-repudiation

C.
Key escrow

D.
Certificate revocation list

Explanation:
Key escrow is a database of stored keys that later can be retrieved.
Key escrow addresses the possibility that a third party may need to access keys. Under the conditions of key
escrow, the keys needed to encrypt/decrypt data are held in an escrow account (think of the term as it relates to
home mortgages) and made available if that third party requests them. The third party in question is generally
the government, but it could also be an employer if an employee’s private messages have been called into
question.