While designing a switched topology, in which two options is UplinkFast recommended? (Choose two)

While designing a switched topology, in which two options is UplinkFast recommended? (Choose two)
A . when switches of different spanning-tree types are connected (for example. 802.1d connecting to 802.1w)
B. on distribution layer switches
C. when hello timers are changed to more aggressive values
D. on access layer switches
E. on the core switches

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Answer: A,D