Practice finding relative minima and maxima of functions given algebraically.

Problem

Let h, left parenthesis, x, right parenthesis, equals, minus, x, start superscript, 3, end superscript, plus, 3, x, start superscript, 2, end superscript, minus, 4.
For what value of x does h have a relative maximum ?
Please choose from one of the following options.