Which statement about vlan operation o

Which statement about vlan operation on cisco catalyst switches is true?（）

A when a packet is received from an 802.1Q trunk,the vlan id can be determined from the source MAC address table.
B unkown unicast frames are retransmitted only to the ports that belong to the same vlan
C ports between switches should be configured in access mode so that vlans can span across the ports
D broadcast and multicast frames are retransmitted to ports that are configured on different vlan.

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