Alison wants to construct the perpendicular bisector of mn¯¯¯¯¯¯¯. what should alison do for her first step? a.) place the point of the compass on point m and draw an arc, using a width for the opening of the compass that is equal to 1/2mn . b.) place the point of the compass on point m and draw an arc, using a width for the opening of the compass that is greater than 1/2mn. c.) place the point of the compass on point m and draw an arc, using a width for the opening of the compass that is less than 1/2mn. d.) use the straightedge to draw a line that intersects mn¯¯¯¯¯¯¯ at a point between m and n.