The directional derivative of the function f(x, y) = x2

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M: +1.00/-0.33

The directional derivative of the function f(x, y) = x² + y² along a line directed from (0, 0) to (1, 1), evaluated at the point x = 1, y = 1 is

[GATE ME 2019 Set 2]

A 2

B √2

C 4√2

D 2√2