Normalize the following equation.\(\phi_f=\phi_c+\frac{\phi_d-\phi_u}{4}\) Where,Φf → Flow variable at the face.Φc → Flow variable at the upwind node.Φd → Flow variable at the downwind node.Φu → Flow variable at the far upwind node.

• A. \(\tilde{\phi_f}=\tilde{\phi_c}+\frac{1}{4}\)
• B. \(\tilde{\phi_f}=\frac{\tilde{\phi_c}}{4}\)
• C. \(\tilde{\phi_f}=1+\frac{\tilde{\phi_c}}{4}\)
• D. \(\tilde{\phi_f}=\tilde{\phi_c}+\frac{3}{4}\)