【单选题】
Which type of scheme describes the default operation of Gateway Load Balancing Protocol  （GLBP）？（）
A、 per host using a round robin scheme
B、 per host using a strict priority scheme
C、 per session using a round robin scheme
D、 per session using a strict priority scheme
E、 per GLBP group using a round robin scheme
F、 per GLBP group using a strict priority scheme
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