Discussion
Which operation adds a direct offset while leaving the shape untouched?
Answer: D
A clamper adds a direct offset so that the positive or negative peak rests at a chosen level, leaving the waveform's shape and amplitude intact. Removing part of the waveform is clipping, amplitude reduction is attenuation, and keeping one polarity is rectification. The distinction matters in practice because a clamper is used to restore a direct level that capacitive coupling has removed, which no clipper could do. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.
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