A managed security provider $($MSP$)$ is engaging with a customer who was working through a complete digital transformation. Part of this transformation involves a move to cloud servers to ensure a scalable, high$-$performance, online user experience. The current architecture includes:

$$ Directory servers

$$ Web servers

$$ Database servers

$$ Load balancers

$$ Cloud$-$native VPN concentrator

$$ Remote access server

The MSP must secure this environment similarly to the infrastructure on premises. Which of the following should the MSP put in place to BEST meet this objective? $($Choose three.$)$

A$.$ Content delivery network

B$.$ Virtual next$-$generation firewall

C$.$ Web application firewall

D$.$ Software$-$defined WAN

E$.$ External vulnerability scans

F$.$ Containers