A. Inline CSS
B. Internal CSS
C. Embedded CSS
D. External CSS

Solution

D. External CSS

Explanation

<p><span style="font-size: 14px;">An External CSS file allows the same styles to be applied to multiple HTML pages. This ensures:</span></p><p><span style="font-size: 14px;"><br></span></p><ul><li><span style="font-size: 14px;">A consistent look and feel across the website.</span></li><li><span style="font-size: 14px;">Easier maintenance (change one CSS file to update all pages).</span></li><li><span style="font-size: 14px;">Reduced code duplication.</span></li></ul>