Compute the Gradient of the Function at the Given Point ${\nabla} f = - 9 i - 40 j$

Multiple Choice

Compute the gradient of the function at the given point.
-f(x, y) = 3x - 10y, (3, -4)

A) ${\nabla} f = - 9 i - 40 j$
B) ${\nabla} f = 3 \mathbf { i } - 10 \mathbf { j }$
C) ${\nabla} f = - 9 \mathrm { i } + 40 \mathrm { j }$
D) ${\nabla} f = - 3 \mathbf { i } - 4 \mathbf { j }$