Albert draws two angles $\angle \mathrm{XYZ}=60°$ and $\angle \mathrm{ABC}=90°$. Which of the following is correct perpendicular lines?

In geometry, when two lines are perpendicular, it means they intersect at a right angle (90 degrees).

$\angle \mathrm{XYZ}=60°$
$\angle \mathrm{ABC}=90°$

The correct choice is AB⊥BC. This notation indicates that line segment AB is perpendicular to line segment BC. 
Given that ∠ABC = 90°, it implies that line segments AB and BC are perpendicular to each other.