Answer: The correct answer is everything except adjusting it to be SmartArt. You can originally add it as SmartArt if you are adding the triangle through that feature.
Explanation: There are a number of ways that a triangle can be adjusted after being inserted into a diagram. The different ways include:
-by making it bigger
-by making it smaller
-by adjusting it to be a different style
-by making it thicker
-by adjusting it to be a different color
-by rotating it
