The correct answer is (b) <main>
Explanation: Human readable date/time is shown by <time> element. The main content of a document is specified by <main> element. The content written inside <main> element should be unique to the document. It should not contain any content that is repeated across documents such as navigation links, copyright information, site logos, search forms. Sections in document is defined by <section> element. The additional details that the user can view or hide on demand is specified by <details> tag.