If we know the value of θ1,ν1 at point 1 and θ2,ν2 in a flow, then what is the flow field condition at an internal point 3 lying at the intersection of characteristic lines passing from points 1 and 2?

• A. θ3 = \(\frac {(K_- )_1 + (K_+ )_2}{2}\)
• B. θ3 = \(\frac {(K_- )_1 + (K_+ )_3}{2}\)
• C. θ3 = \(\frac {(K_+ )_1 + (K_+ )_2 + (K_+ )_3}{2}\)
• D. θ3 = \(\frac {(K_- )_1 + (K_- )_2 + (K_- )_3}{2}\)