In the SIB1 message, if the expected preamble power is -100dBm, the SSB transmit power is 18dBm, and the current RSRP is -90dBm, then what is the transmit power of the terminal’s first PRACH preamble?

In the SIB1 message, if the expected preamble power is -100dBm, the SSB transmit power is 18dBm, and the current RSRP is -90dBm, then what is the transmit power of the terminal’s first PRACH preamble?
A . 10dBm
B . -108dBm
C . 8dBm
D . -118dBm

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Answer: C