What are the differences between FDD and TDD in PRACH channel design? (Multiple choice)

What are the differences between FDD and TDD in PRACH channel design? (Multiple choice)
A . TDD supports short RACH (format4)
B . The short RACH time domain resource is on the UpPTS and shares the UpPTS frequency domain resource with Sounding.
C . frequency domain occupies 6 RBs, the number of symbols occupied by the time domain is determined by the radius of the supported access
D . Because there are few TDD uplink subframes, multiple RACH channels in the same subframe are allowed.

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Answer: ABD