3. Determine whether the binary relation is reflexive, symmetric, antisymmetric, and/or transitive. [12 pts.] a. The relation R on {w, x, y, z} where R = {( w, W), ( w, x), ( x, w), ( x, x), ( x, z), ( y, y ), ( z, y ), ( z, z) }. b. The relation R on Z where aRb means la - b|