In which type of physical deployment does a ProxySG have potential visibility to all traffic through the use of a device such as WCCP-capable router or a Layer 4 switch?

In which type of physical deployment does a ProxySG have potential visibility to all traffic through the use of a device such as WCCP-capable router or a Layer 4 switch? (Choose the best answer.)
A. Transparent
B. Explicit
C. Layer 4
D. In-path

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