Which of the following limits is equal to ∈ t _35x4dx A limlimits _nto ∈ fty sumlimits _k-1n3+ k/n 4 . 1/n B limlimits _nto ∈ fty sumlimits _k-1n3+ k/n 4 . 2/n C limlimits _nto ∈ fty sumlimits _k-1n3+ 2k/n 4 . 1/n D limlimits _nto ∈ fty sumlimits _k-1n3+ 2k/n 4 . 2/n