If Va, Vb, and Vc are in volts, calculate the coefficient c1. Enter your answer as a decimal, rounded to two decimal places. Make sure your answer has the correct sign.
a) Depends on the values of Va, Vb, and Vc
b) c1 = Va + Vb + Vc
c) c1 = Va × Vb × Vc
d) c1 = (Va + Vb + Vc)/3