निम्नलिखित ज्यामितीय आकृतियों में से कौन सा विषम (अलग) है? वृत्त (Circle), त्रिभुज (Triangle), घन (Cube), वर्ग (Square)

Find the odd one out among the given options.

Find the letter group which is different from the other three options:

Which item does NOT fit the group based on their primary function?