= Solution
\b[Anticommuting-variable dependence alone is not the defining condition:] a <superfield> must carry a specified <Super-Poincaré group> transformation law. Any appropriately graded function on <superspace> becomes an unconstrained scalar <superfield> under coordinate pullback, but an arbitrary collection of coefficients in a <Grassmann variable> polynomial is not automatically a prescribed <supermultiplet>. For example, a <chiral superfield> has $\Phi(y,\theta)=A(y)+\sqrt2\theta\psi(y)+\theta^2F(y)$, with $y^\mu=x^\mu+i\theta\sigma^\mu\bar\theta$ and $\bar D_{\dot\alpha}\Phi=0$; a <vector superfield> obeys $V=V^\dagger$ and contains a gauge vector, <gaugino> and <auxiliary field> in <Wess-Zumino gauge>. A polynomial with constant component fields can be a special <chiral superfield>; lack of explicit spacetime dependence alone does not disqualify it. This is <superfield covariance is not Grassmann dependence alone>.
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