Hot Standby Router Protocol (HSRP) is able to provide network redundancy for IP networks. Concerning HSRP load sharing, which two descriptions make sense?（）
- A It is achieved by using more than one HSRP group.
- B It is done in regards to either round robin or weight basis.
- C It is used to offload the active router in a certain HSRP group.
- D The return traffic is influenced by HSRP load sharing configuration.
- E Single group HSRP is used to achieve more efficient link utilization.