Anybody know this I’ll give you brainless?

  your mark is correct

Step-by-step explanation:

The marked answer choice is correct.

(2, -18) is not a global minimum, because there are function values that are lower.

(0, -6) is not a global maximum, because there are function values that are higher.

A global maximum is also a local maximum.*

* More correctly, a global maximum is either a local maximum or the end point of an interval. No intervals are involved in this question.