Discussion
Why is offset current specified separately from bias current?
Answer: C
If both inputs see the same resistance, equal bias currents produce equal voltages that cancel in the difference, leaving only the mismatch between them to matter - and that mismatch is the offset current. Neither depends on signal presence or supply, and both are quoted at a stated temperature. Splitting a specification into a part that can be cancelled by design and a part that cannot is what makes it useful, and it tells the designer to match the input resistances.
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