Final answer:
The digital certificate received by Renee from a trusted CA contains her public key, which is used for encrypting messages sent to her.
Step-by-step explanation:
When Renee received a digital certificate from a trusted certificate authority (CA), it contains Renee's public key. The digital certificate is a form of identification for online transactions or communications, and it associates Renee's public key with her identity. This allows others to use this public key to encrypt messages to Renee, which only she can decrypt using her private key. The CA's role is to validate identities and issue certificates. It is crucial to never include Renee's private key or the CA's private key in the certificate since these should remain confidential to maintain security.