In which step in the contention-based random-access process is to set an additional power offset?

In which step in the contention-based random-access process is to set an additional power offset?
A . Step 3: Send a Layer 2/Layer 3 message
B . Step 4: Send a competition mode resolution message
C . Step 1: Transfer the preamble sequence
D . Step 2: Random Access Response

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Answer: C