  The complexified ${\Bbb Z}/2$-graded $C^\infty$-Algebraic Geometry aspect of
a superspace(-time) $\widehat{X}$ in Sec.\,1 of D(14.1) (arXiv:1808.05011
[math.DG]) together with the Spin-Statistics Theorem in Quantum Field Theory,
which requires fermionic components of a superfield be anticommuting, lead us
to the notion of towered superspace(-time) $\widehat{X}^{\widehat{\boxplus}}$
and the built-in purely even physics sector $X^{\mbox{physics}}$ from
$\widehat{X}^{\widehat{\boxplus}}$. We use this to reproduce the $d=3+1$, $N=1$
Wess-Zumino model and the $d=3+1$, $N=1$ supersymmetric $U(1)$ gauge theory
with matter --- as in, e.g., Chap.\,V and Chap.\,VI \& part of Chap.\,VII of
the classical Supersymmetry \& Supergravity textbook by Julius Wess and
Jonathan Bagger --- and, hence, recast physicists' two most basic
supersymmetric quantum field theories solidly into the realm of (complexified
${\Bbb Z}/2$-graded) $C^\infty$-Algebraic Geometry. Some traditional
differential geometers' ways of understanding supersymmetric quantum field
theories are incorporated into the notion of a
purge-evaluation/index-contracting map ${\cal
P}:C^\infty(X^{\mbox{physics}})\rightarrow C^\infty(\widehat{X})$ in the
setting. This completes for the current case a $C^\infty$-Algebraic Geometry
language we sought for in D(14.1), footnote 2, that can directly link to the
study of supersymmetry in particle physics. Once generalized to the nonabelian
case in all dimensions and extended $N\ge 2$, this prepares us for a
fundamental (as opposed to solitonic) description of super D-branes parallel to
Ramond-Neveu-Schwarz fundamental superstrings
