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The number of non-negative integral solutions of \( \mathrm{x}_{1}+\mathrm{x}_{2}+\mathrm{x}_{3}+\mathrm{x}_{4} \leq \mathrm{n} \) (where \( \mathrm{n} \) is a positive integer) is
\( \mathrm{P} \)
(A) \( { }^{n+3} C_{3} \)
(B) \( { }^{n+4} C_{4} \)
(C) \( { }^{n+5} C_{5} \)
(D) \( { }^{n+4} C_{n} \)
W)
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