What are the contents of the following HTML tag set? <body>Hello.</body>
<body>
</body>
body
Hello.
The contents of the first tag set (<body>Hello.</body>) is the text "Hello." which will be displayed on the web page.
The contents of the second tag set (<body></body>) is empty and will not display any content on the web page.
The third content is the word "body" itself, which is not enclosed in any HTML tags and will be treated as plain text.