Which of the following are valid NFSv4 security types?

RSA is an asymmetric encryption algorithm and a component of many security systems, but not a standalone 'security type' or mechanism for NFSv4 in the same way Kerberos or SPKM are protocols.

SSL (Secure Sockets Layer) or TLS (Transport Layer Security) are protocols for securing network communications, but NFSv4 integrates security directly through GSS-API mechanisms like Kerberos rather than encapsulating itself within an SSL/TLS tunnel.

SPKM (Simple Public Key Mechanism) is a security mechanism defined in RFC 2874 that NFSv4 can use through GSS-API for authentication services.

Kerberos (krb5, krb5i, krb5p) is a widely adopted network authentication protocol that NFSv4 utilizes via GSS-API for strong authentication, integrity, and privacy protection.

LIPKEY (Lightweight Internet Protocol Key Exchange) is another GSS-API security mechanism that can be supported by NFSv4 implementations, offering various security services.