3 marks] Let y have a geometric distribution with probability mass function f(y; p) (1 -p)p,y = 0,1,2,3,---. The deviance residual for observation i is given by sign(y; i)'/d_?, where d? is the deviance associated with observation i, and is written as a function of the response variable y; and the fitted value f;, while sign(-) is the sign function defined in this course. What is the correct expres- sion for d when the generalised linear model is geometric? Please simplify your expression as much as you can