Virtual IP addresses (VIPs) are used by SLBs such as the Cisco Content Services Switch and Content Switching Module to represent content hosted on one or more servers under their control. The use of VIPs allows for traffic to be balanced among multiple origin servers, application servers, or transaction servers in a way that results in faster response times for users and less network congestion for the host A customer wants to use a single VIP. A second VIP will be used only if the first is overloaded or unavailable. What method of GSLB reply is best suited until that VIP is overloaded or unavailable?

A.
DNS query

B.
DNS trace

C.
least-loaded

D.
weightedrounD.robin