Which type of authorization provides a mechanism to validate both sender and receiver?

Which type of authorization provides a mechanism to validate both sender and receiver?

• Kerberos
• Anonymous
• RADIUS
• TACACS 

EXPLANATION

Kerberos is a computer network authentication protocol that works on the basis of tickets to allow nodes communicating over a non-secure network to prove their identity to one another in a secure manner. The protocol was named after the character Kerberos from Greek mythology, the ferocious three-headed guard dog of Hades. Kerberos An access control system that was developed at MIT in the 1980s. Turned over to the IETF for standardization in 2003, it was designed to operate in both small companies and large enterprises with multiple domains and authentication servers.