Final answer:
Root certification authorities issue their own certificates.
Step-by-step explanation:
A certification authority (CA) is responsible for issuing digital certificates that verify the authenticity of a website or organization. There are two types of CAs: root CAs and intermediate CAs. Root CAs issue their own certificates and are self-signed, while intermediate CAs are authorized by root CAs to issue certificates on their behalf.
Root CAs are the highest level in the trust hierarchy and their certificates can be found in web browsers and operating systems. Examples of root CAs include VeriSign, Comodo, and Entrust. Intermediate CAs are affiliated with root CAs and issue certificates for specific domains or organizations.
So, to answer your question, root certification authorities issue their own certificates.