How Can You Avoid a Hidden Links Error

How can you avoid a hidden links error?

A) Make sure users can use the back button to return to prior pages.
B) Make sure your pages conform to users expectations by providing commonly used icon links.
C) Make sure users know which links are internal anchor points versus external links and indicate if a link brings up a separate browser window from those that do not.
D) Make sure you leave a border around images that are links,do not change link colors from normal defaults,and avoid embedding links within long blocks of text.