1.If f(x)=kx3−9x2+9x+3f(x) = kx^3 - 9x^2 + 9x + 3f(x)=kx3−9x2+9x+3 is monotonically increasing in every interval, then which one of the following is correct?a.k<3k < 3k<3b.k≤3k \le 3k≤3c.k>3k > 3k>3d.k≥3k \ge 3k≥3Login to continueOnly logged in users canattempt or see the solution.
