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In the following Poisson regression model, E(y|x) =o+ [31x1 + ,3ng +. . .+ kxk+ , estimated [31 is interpreted as: O a) When x1 increased by 1 unit, y will change by [51 units, holding other factors constant. 0 b) When x1 increased by 1 unit, y will change by [31 percent, holding other factors constant. 0 C) When x1 increased by 1 unit, log count of y will change by [31, holding other factors constant. 0 d) When x1 increased by 1 unit, y will change by Iog(B1) units, holding other factors constant