What is the difference between how RADIUS and TACACS+ handle encryption?

RADIUS encrypts only the username and password fields, whereas TACACS+ encrypts the entire packet.

RADIUS encrypts the entire packet, whereas TACACS+ only encrypts the password field.

RADIUS only encrypts the password field, whereas TACACS+ encrypts the payload of packet.

RADIUS encrypts the entire packet, whereas TACACS+ encrypts only the username and password fields.