Final answer:
Registration authorities (RAs) are subordinate entities that handle specific certificate authority tasks, such as processing certificate requests and verifying the identity of individuals.
Step-by-step explanation:
Subordinate entities designed to handle specific certificate authority (CA) tasks are known as registration authorities (RAs).
These RAs are responsible for tasks such as processing certificate requests and verifying the identity of individuals.
For example, when someone wants to obtain an SSL certificate for their website, they would submit a request to the RA who would then validate their identity before issuing the certificate.