A Chief Information Security Officer $($CISO$)$ is concerned about the organization's ability to continue business operations in the event of a prolonged DDoS attack on its local datacenter that consumes database resources. Which of the following will the CISO MOST likely recommend to mitigate this risk?

A$.$ Upgrade the bandwidth available into the datacenter.

B$.$ Implement a hot$-$site failover location.

C$.$ Switch to a complete SaaS offering to customers.

D$.$ Implement a challenge response test on all end$-$user queries.