Choose the gradient of the function f defined by f(x, y, z)= In[1 + (7xy + 13xz + 17yz)²]. O< 2(7xy+13xz+17yz) 1+(7xy+13xz+17yz)2 2(7xy+13xz+17yz) 1+(7xy+13xz+17yz)² O None of the others O <7y + 13z, 7x + 17z, 13x + 17y > 2(7y+13z) 2(7x+17z) 1+(7xy+13xz+17yz)² 1+(7xy+13xz+17yz)²' O <7y + 13z, 7x + 17z, 13x + 17y> . 2(7xy+13xz+17yz) 1+(7xy+13xz+17yz) ² 1+(7xy+13xz+17yz)² 2(13x+17y) 1+(7xy+13xz+17yz)² 2(7xy+13xz+17yz) 1+(7xy+13xz+17yz)² V

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