A network engineer must configure a Cisco ESA to prompt users to enter two forms of information before gaining access The Cisco ESA must also join a cluster machine using preshared keys What must be configured to meet these requirements?
A. Enable two-factor authentication through a RADIUS server and then join the cluster by using the Cisco ESA CLI.
B. Enable two-factor authentication through a RADIUS server and then join the cluster by using the Cisco ESA GUI
C. Enable two-factor authentication through a TACACS+ server and then join the cluster by using the Cisco ESA GUI.
D. Enable two-factor authentication through a TACACS+ server and then join the cluster by using the Cisco ESA CLI