You are working with a data set that consists of two continuous inputs, x1 and x2. You wish to fit a linear model to predict a continuous response, y. You are interested in trying several formulations for the mean trend, , with respect to the two inputs. Which of the following formulations are linear models? Select all that apply. n=0+1xn,1+2xn,2n=0+1sin(xn,1xn,2)n=0+1xn,12+2xn,22n=0+1log(xn,1)+(2+3xn,1)xn,2