The coefficient of \( x^{4} \) in the expansion of \( \left(1+x+x^{2}+x^{3}\right)^{n} \) is....

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The coefficient of \( x^{4} \) in the expansion of
\( \mathrm{P} \)
\( \left(1+x+x^{2}+x^{3}\right)^{n} \) is
(1) \( { }^{n} C_{4} \)
(2) \( { }^{n} C_{4}+{ }^{n} C_{2} \)
(3) \( { }^{n} C_{4}+{ }^{n} C_{2}+{ }^{n} C_{4} \cdot{ }^{n} C_{2} \)
(4) \( { }^{n} C_{4}+{ }^{n} C_{2}+{ }^{n} C_{1} \cdot{ }^{n} C_{2} \)



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