What makes Oregon’s flag unique among state flags?

Here is the question :

WHAT MAKES OREGON’S FLAG UNIQUE AMONG STATE FLAGS?

Here is the option for the question :

• It only has one color
• It changes every four years
• It has designs on both sides
• It’s square

The Answer:

And, the answer for the the question is :

Explanation:

[STC007024] No state makes the most of its design space like Oregon, which is the only one to use the flag’s two sides for various designs. Oregon was the 33rd state to join the Union, as indicated by the state shield on one side being surrounded by 33 stars. The state animal, a gold beaver, is depicted on the opposing side of the flag against a navy blue backdrop.