What is the first thing a Citrix Administrator should develop when creating a server certificate for Citrix ADC to secure traffic?

A. A private key

B. A certificate revocation list (CRL)

C. A certificate signing request (CSR)

D. A certificate key-pair

Reference: https://docs.citrix.com/en-us/citrix-adc/current-release/ssl/how-to-articles/create-and-use-ssl-certificates-on-a-citrix-adc-appliance.html