While asymmetric encryption solved the key exchange problem faced by symmetric encryption, it is vulnerable to Man$-$In$-$The$-$Middle Attacks, where the attacker replaces the valid asymmetric public key$($s$)$ with their own public key. What is the name of the system that has been implemented to authenticate public keys?

Group of answer choices

PKE

PKI

TKI

DNS

RSA

HMAC