单项选择题
As an experienced technician, you are responsible for Technical Support. Which of the following descriptions is correct about the characteristic of SLB one arm mode?（）
A. This out-of-band approach supports scaling
B. SLB is not inline.
C. Mode is not as common as bridge or routed mode.
D. Return traffic requires PBR, server default gateway pointing to SLB, or client source NAT.
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