Discussion
What makes a bias divider stiff?
Answer: B
A stiff divider is one whose Thevenin resistance is well below the impedance looking into the base, so base current changes barely move the base voltage - a tenth of it is the usual rule. Equal resistors and a half-supply tap are arbitrary choices, and a divider current below the base current would be hopelessly soft. Stiffness is always a comparison between a source impedance and what it drives, never an absolute value. Working one numerical case through both schemes side by side fixes the distinction better than any rule of thumb.
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