Which of these conditions represent a monotonic profile of variable Φ between the far upwind node and downwind node?(Note: \(\tilde{\phi_c}\) is the normalized flow variable at the upwind node).

• A. \(1\leq\tilde{\phi_c}\leq ∞\)
• B. \(0\leq\tilde{\phi_c}\leq 1\)
• C. \(0\leq\tilde{\phi_c}\leq 0.5\)
• D. \(0.5\leq\tilde{\phi_c}\leq 1\)
• E. .a) \(1\leq\tilde{\phi_c}\leq ∞\) b) \(0\leq\tilde{\phi_c}\leq 1\) c) \(0\leq\tilde{\phi_c}\leq 0.5\) d) \(0.5\leq\tilde{\phi_c}\leq 1\)