If f(x, y) = 2x² + 5y? and u is the unit vector in the direction of *, which of the following expressions equals Duf(x,y)? 2 V3 t. 2 Ch) - (2a? – (2x² + 5y²) 2 x + +5| у + 2 lim h→0 h 2 2 1 2| x 2 V3 +5( y 2 – (2æ² + 5y²) - | - lim h→0 h 2 3, 2 x + 2 1 + 5( y+ -h 2 – (2x² + 5y²) lim h→0 h 2 2, 2 x + 2 +5(y+ – (2x² + 5y²) - 2 lim h→0 h

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A: A detailed solution is given below.