What is the wireless received signal strength indicator?

What is the wireless received signal strength indicator?
A . The value of how strong the wireless signal is leaving the antenna using transmit power, cable loss, and antenna gain
B . The value given to the strength of the wireless signal received compared to the noise level
C . The value of how much wireless signal is lost over a defined amount of distance
D . The value of how strong a tireless signal is receded, measured in dBm

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Answer: D