what is a typical usable range for client signal strength?

When performing a site survey, what is a typical usable range for client signal strength?

A.
‐70 to ‐90 dBm

B.
‐60 to ‐80 dBm

C.
‐45 to ‐65 dBm

D.
‐30 to ‐50 dBm