A security engineer implements a secure wireless network. In doing so$,$ the engineer decides to use EAP with Flexible Authentication via Secure Tunneling $($EAP$-$FAST$).$ Which authentication approach does the engineer implement?Protected Access Credential $($PAC$)$ instead of a certificateAny inner authentication protocol such as PAP or CHAPOnly requiring a server$-$side public key certificateThe supplicant and server are configured with certificates.