Methods to Associate Styles with HTML Documents

There are several ways to associate styles with a HTML document. Here are the most common methods:

Inline CSS: Styles are applied directly within the HTML element using the 'style' attribute. For example:

<p style='color: blue;'>This text is blue.</p>

Embedded CSS: Styles are defined within the <style> tag in the HTML document's <head> section. For example:

<head>
  <style>
p { color: red; }
</style>
</head>

External CSS: Styles are defined in a separate CSS file, which is linked to the HTML document using the <link> tag in the <head> section. For example:

<head>
  <link rel='stylesheet' href='styles.css'>
</head>

Therefore, the correct answer is 'D. All of the above'.