Geometry

Question Analysis:
This is a conceptual identification question.
The main focus is recognizing which properties are sometimes, not always, true.

Key Concept Explanation:
While most properties of parallelograms are consistent, perpendicular diagonals are not one of them—they apply only to specific types like rhombuses.

Step-by-Step Solution:
Go through each option:
A – Always true.
B – Always true.
C – Only true in rhombuses or squares.
D – Always true.

Com...