Which of the following is a tautomer of phenol?

• A. <a href="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-tautomerism-q4a.png"><img alt="The following is a tautomer of phenol - option a" class="alignnone size-full wp-image-224706" height="85" src="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-tautomerism-q4a.png" width="57"/></a>
• B. <a href="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-tautomerism-q4b.png"><img alt="The following is a tautomer of phenol - option b" class="alignnone size-full wp-image-224707" height="89" src="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-tautomerism-q4b.png" width="68"/></a>
• C. <a href="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-tautomerism-q4c.png"><img alt="The following is a tautomer of phenol - option c" class="alignnone size-full wp-image-224708" height="78" src="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-tautomerism-q4c.png" width="61"/></a>
• D. <a href="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-tautomerism-q4d.png"><img alt="The following is a tautomer of phenol - option d" class="alignnone size-full wp-image-224709" height="83" src="https://www.sanfoundry.com/wp-content/uploads/2018/08/organic-chemistry-questions-answers-tautomerism-q4d.png" width="85"/></a>