If x = 1 is a critical point of the function f(x) = (3x2 + ax – 2 – a) ex, then :
(1) x = 1 is a local minima and x = – 2/3 is a local maxima of f.
(2) x = 1 is a local maxima and x = – 2/3 is a local minima of f.
(3) x = 1 and x = – 2/3 are local minima of f.
(4) x = 1 and x = – 2/3 are local maxima of f