Which three of these statements regarding 802.1Q trunking are correct? (Choose three.)

A.
802.1Q native VLAN frames are untagged by default.

B.
802.1Q trunking ports can also be secure ports.

C.
802.1Q trunks can use 10 Mb/s Ethernet interfaces.

D.
802.1Q trunks require full-duplex, point-to-point connectivity.

E.
802.1Q trunks should have native VLANs that are the same at both ends.

Explanation:
CCNA Self-Study (ICND Exam):
Extending Switched Networks with Virtual LANs
http://www.ciscopress.com/articles/article.asp?p=102157&seqNum=2
Topic 2, IP Routing Technologies