P l e a s e h e l p w i l l g i v e b ra in li es t Look at triangle ABC.

The coordinate grid shows negative 5 to positive 5 on the x-axis and y-axis at intervals of 1. A triangle ABC is shown with A at ordered pair 4, 5, B at ordered pair 2, 1, and C at ordered pair 4, 1.

What is the length of side AB of the triangle?

2
The square root of 20
6
The square root of 38