问题：

[单选]

pany uses GLBP to provide for router redundancy in the network. 
Which describes the default  load balancing scheme used by the Gateway Load Balancing Protocol （GLBP）？（）

A .  Per host basis using a strict priority scheme
B .  Per session using a round-robin scheme
C .  Per session using a strict priority scheme
D .  Per GLBP group using a strict priority scheme
E .  Per host basis using a round-robin scheme
F .  Per GLBP group using a round-robin scheme