Which Layer 2 protocol encapsulation type supports synchronous and asynchronous circuits and has built-in security mecha

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answerhappygod
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Which Layer 2 protocol encapsulation type supports synchronous and asynchronous circuits and has built-in security mecha

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Which Layer 2 protocol encapsulation type supports synchronous and asynchronous circuits and has built-in security mechanisms?

A. HDLC
B. PPP
C. X.25
D. Frame Relay
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