Consider the points \( A(\vec{a}) ; B(\vec{b}) ; C(\vec{c}) \) and \( D(\vec{d}) . x \) is the distance of the point \( A \) from the plane \( B C D . y \) is the distance of the point \( D \) from the plane \( A B C \).
(a) \( \mathrm{A} \rightarrow \mathrm{q} ; \mathrm{B} \rightarrow \mathrm{r} ; \mathrm{C} \rightarrow \mathrm{s} ; \mathrm{D} \rightarrow \mathrm{p} \);
(b) \( \mathrm{A} \rightarrow \mathrm{r} ; \mathrm{B} \rightarrow \mathrm{q} ; \mathrm{C} \rightarrow \mathrm{p} ; \mathrm{D} \rightarrow \mathrm{s} \);
(c) \( \mathrm{A} \rightarrow \mathrm{q} ; \mathrm{B} \rightarrow \mathrm{p} ; \mathrm{C} \rightarrow \mathrm{r} \); \( ; \mathrm{D} \rightarrow \mathrm{p} \);
(d) \( \mathrm{A} \rightarrow \mathrm{q} ; \mathrm{B} \rightarrow \mathrm{s} ; \mathrm{C} \rightarrow \mathrm{r} ; \mathrm{D} \rightarrow \mathrm{p} \);
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