In Order to Find Whether a Local Maximum Is a Global

Multiple Choice

In order to find whether a local maximum is a global maximum, one must

A) set the second derivative to 0 and solve for $x$ and check whether the function is negative at that $x$
B) check whether the second derivative is negative at the value of $x$ corresponding to the local maximum
C) set the second derivative to 0 and solve for $\mathrm{x}$ and check whether the function is positive at that $\mathrm{x}$
D) check whether the second derivative is positive at the value of $x$ corresponding to the local maximum