When two mechanical waves occupy the same region of a medium simultaneously, which statement best describes the net displacement of the medium at any point?
(a) It equals the arithmetic mean of the individual displacements at that point.
(b) It equals the algebraic sum of the individual displacements produced by each wave at that point.
(c) It equals the sum of the magnitudes of the individual displacements, disregarding their directions.
(d) It equals the difference between the larger and smaller of the individual displacements at that point.