1. Parts (a) (c) refer to the vector field F shown to the right, together with the 5 curves C1, C2, ...; C5. Let Ce be the closed curve given by C1 + 02 + C3 + CA. C5 C3 (a) Is Jo F . dr positive, negative, or zero? Explain, using a complete sentence. (b) Is fo F . dr positive, negative, or zero? Explain, using a complete sentence. (c) Rank the following quantities in order from smallest to largest: F. dr, F. dr, F. dr, F.dr, J F . dr