Which two statements about sticky MAC address learning are true? (Choose two.)
A . A single device can learn up to three sticky MAC addresses.
B . Devices can learn sticky MAC addresses dynamically.
C . Learned addresses are saved to the startup configuration file by default.
D . Learned addresses are saved to the running configuration by default.
E . Learned addresses are automatically preserved when the device reboots.
F . It can be used only on devices that operate in a single layer.
Answer: BD