The electrical potential existing in space is $\;V\;(x , y, z) = A\;(xy+yz+zx)\;$ . Find the expression for the electric field

Question

$(a)\;A\;((y+z) \hat{i}+(x+z) \hat{j} +(x+y) \hat{k})\qquad(b)\;A\;(x \hat{i}+y \hat{j} +z \hat{k})\qquad(c)\;-A\;((y+z) \hat{i}+(x+z) \hat{j} +(x+y) \hat{k})\qquad(d)\;-A(x \hat{i}+y \hat{j} +z \hat{k})$