Sum Big-O

If

N=i=0ni3N=\sum _{ i=0 }^{ n }{ { i }^{ 3 } }

which of the following is equal to NN?

A: Θ(n4)\Theta(n^{4})

B: Θ(n5)\Theta(n^{5})

C: O(n5)O(n^{5})

D: Ω(n3)\Omega(n^{3})

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