Let $S=\{-10,-9, \ldots, 9,10\}$. Describe each of the following sets as $\{x \in S: p(x)\}$, where $p(x)$ is some condition on $x$.
(a) $A=\{-10,-9, \ldots,-1,1, \ldots, 9,10\}$
(b) $B=\{-10,-9, \ldots,-1,0\}$
(c) $C=\{-5,-4, \ldots, 0,1, \ldots, 7\}$
(d) $D=\{-10,-9, \ldots, 4,6,7, \ldots, 10\}$.