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D1.2. A vector field S is expressed in rectangular coordinates as S = {125/ [(x-1)²+(y-2)²+(z+1)²]}{(x − 1)ax +(y-2)ay +(z+1)az}. (a) Evaluate S at P(2, 4, 3). (b) Determine a unit vector that gives the direction of S at P. (c) Specify the surface f(x, y, z) on which |S| = 1. Ans. 5.95ax +11.90ay +23.8az; 0.218ax +0.436ay +0.873az; √(x − 1)² + (y − 2)² + (z + 1)² = 125