Which two statements about Cisco HDLC are true? (Choose two)

Which two statements about Cisco HDLC are true? (Choose two)
A . Cisco HDLC is the preferred protocol in multivendor environments.
B . Cisco routers can carry multiple network-layer protocols simultaneously over the same HDLC link
C . Cisco HDLC supports authentication of peering routers on the same HDLC link
D . Cisco HDLC is the default encapsulation on Serial and Dialer interfaces.
E . Cisco HDLC allows routers to negotiate the supported network-layer protocols before sending their packets over an HDLC link
F . Cisco HDLC allows bundling of multiple links between the same pair of routers into a faster communication channel

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Answer: DE