The network administrator for a company is setting up a website with e-commerce capabilities. Packet sniffing is a concern because credit card information will be sent electronically over the Internet

SSL/TLS certificates are X.509 certificates that use an asymmetric key pair - a public key embedded in the certificate and a corresponding private key held by the server. The asymmetric algorithm is used during the TLS handshake to authenticate the server and securely exchange keying material. This is the certificate type that enables HTTPS encryption for e-commerce transactions.

'Confidential' is not a recognized cryptographic certificate type or classification in any standard PKI or SSL/TLS framework.

Symmetric encryption uses a single shared key for both encryption and decryption; while TLS does use a symmetric session key for bulk data transfer, the certificate itself is asymmetric and is not a 'symmetric certificate'.

'Non-confidential' is not a defined certificate type in any PKI, TLS, or cryptographic standard.