Answer:
A. CSR
Explanation:
CSR, (certificate signing request also known as certification request, CR) are messages sent by an applicant to a certificate authority to acquire a digital identification certificate or renew an already existing one. It contains information of the client or applicant like domain name, public key etc.
Keyescrow, CRLD and OCSP are not recommended or required for renewing digital certificate as they commands or settings for shortcuts and commands.
