Which of the following represent the square nut?

• A. <img alt="Wing screw has wing grip that helps in manual operating - option a" class="alignnone size-full wp-image-300725" height="195" sizes="(max-width: 430px) 100vw, 430px" src="https://www.sanfoundry.com/wp-content/uploads/2020/12/engineering-drawing-questions-answers-conventional-symbols-nuts-bolts-q5.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2020/12/engineering-drawing-questions-answers-conventional-symbols-nuts-bolts-q5.png 430w, https://www.sanfoundry.com/wp-content/uploads/2020/12/engineering-drawing-questions-answers-conventional-symbols-nuts-bolts-q5-300x136.png 300w" width="430"/>
• B. <img alt="Wing screw has wing grip that helps in manual operating - option b" class="alignnone size-full wp-image-300727" height="124" sizes="(max-width: 396px) 100vw, 396px" src="https://www.sanfoundry.com/wp-content/uploads/2020/12/engineering-drawing-questions-answers-conventional-symbols-nuts-bolts-q6b.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2020/12/engineering-drawing-questions-answers-conventional-symbols-nuts-bolts-q6b.png 396w, https://www.sanfoundry.com/wp-content/uploads/2020/12/engineering-drawing-questions-answers-conventional-symbols-nuts-bolts-q6b-300x94.png 300w" width="396"/>
• C. <img alt="Wing screw has wing grip that helps in manual operating - option c" class="alignnone size-full wp-image-300724" height="158" sizes="(max-width: 406px) 100vw, 406px" src="https://www.sanfoundry.com/wp-content/uploads/2020/12/engineering-drawing-questions-answers-conventional-symbols-nuts-bolts-q4.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2020/12/engineering-drawing-questions-answers-conventional-symbols-nuts-bolts-q4.png 406w, https://www.sanfoundry.com/wp-content/uploads/2020/12/engineering-drawing-questions-answers-conventional-symbols-nuts-bolts-q4-300x117.png 300w" width="406"/>
• D. <img alt="Wing screw has wing grip that helps in manual operating - option d" class="alignnone size-full wp-image-300718" height="111" sizes="(max-width: 363px) 100vw, 363px" src="https://www.sanfoundry.com/wp-content/uploads/2020/12/engineering-drawing-questions-answers-conventional-symbols-nuts-bolts-q1d.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2020/12/engineering-drawing-questions-answers-conventional-symbols-nuts-bolts-q1d.png 363w, https://www.sanfoundry.com/wp-content/uploads/2020/12/engineering-drawing-questions-answers-conventional-symbols-nuts-bolts-q1d-300x92.png 300w" width="363"/>