Which expression describes the propagation of uncertainty for a product or quotient of measurements?

• A. e = sqrt((ex1/x1)^2 + (ex2/x2)^2 + (ex3/x3)^2)
• B. e = y * sqrt((ex1/x1)^2 + (ex2/x2)^2 + (ex3/x3)^2 + ...)
• C. e = y * sqrt((ex1/x1)^2 + (ex2/x2)^2 + (ex3/x3)^2)
• D. e = sqrt((ex1/x1)^2 + (ex2/x2)^2 + (ex3/x3)^2) / y

Answer: (B)