Which expression correctly describes the propagation of uncertainty for a quantity obtained by multiplying and dividing several measurements?

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

Answer: (B)