Question: Which of these formulae is correct to find the gradient of the element ‘k’?

Options

A : ??k = frac{1}{V_k}(Sigma_{nleftarrow f<k}Phi_nvec{S_n}-Sigma_{nleftarrow f>k} Phi_nvec{S_n})

B : ??k = frac{1}{V_k}(-Sigma_{nleftarrow f}Phi_n vec{S_n})

C : ??k = frac{1}{V_k}(Sigma_{nleftarrow f}Phi_n vec{S_n})

D : ??k = frac{1}{V_k}(- Sigma_{nleftarrow f<k}Phi_nvec{S_n}+Sigma_{nleftarrow f>k} Phi_nvec{S_n})

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