The vertices of a triangle are P(-4, 1), Q(-2,-8), and R(8, -1). What are the vertices of the image reflected across the y-axis?
P'(-4,-1), Q'(-2, 8), and R'(8, 1)
P'(4, -1), Q(2, 8), and R'(-8, 1)
P'(4, 1), Q'(2, -8), and R'(-8, -1)
P'(-4, 1), Q'(-2, -8), and R'(8, -1)