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: B,D