HTML isn't really used for this anymore, it's done via CSS (Cascading Style Sheets). On the web currently, HTML pretty much just describes what to be displayed, CSS describes how it's to be displayed and JavaScript is used to provide function to a web page.
In HTML, you could use: align="center" as an attribute of the img tag to center it. Now it's preferable to use text-align: center CSS for the object containing the image (a div or p).
Positioning things on top of each other brings in z-axis and position CSS. Check out the CSS tutorial at http://www.w3schools.com . It's free.
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Hey! The answer you're looking for is D. Uniform Resource Locator.
Answer:
Get to the point at the beginning of the memo.
Keep the paragraph lengths short.
At the end, inform the readers if there are specific actions they need to take.
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