HSRP. Known as Hot Stanclby Router Protocol, is a Cisco proprietarv redundancy protocol . As an experienced network administrator, you are required to configure HSRP on a XYZ network. Which TWO of the following wii be available and shared between the routers configured with HSRP? （）(Choose two.)

• A、a shared single interface
• B、the ability to track serial interfaces
• C、UDP-based hello packets
• D、the impact of flapping links if timers are too low