Discussion
How is a common-base stage typically biased?
Answer: B
In practice the direct bias is arranged exactly as for a common-emitter stage and the base is then bypassed to ground with a capacitor, so it is common for signals but biased normally. Tying the base to the supply would forward bias the collector junction, and a grounded emitter leaves nothing to drive. Separating what a node does for direct current from what it does for signals is the key to reading any of these circuits. A single measurement chosen to respond to the one asymmetry beats several that respond to shared behaviour.
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