two statements about LLDP are true? (choose two)

two statements about LLDP are true? (choose two)
A . It uses mandatory TLVs to discover the neighboring devices
B . It functions at Layer 2 and Layer 3
C . It is a Cisco-proprietary technology
D . It is implemented in accordance with the 802.11a specification
E . It enables systems to learn about one another over the data-link layer

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Answer: AE