What is the order of sea stack sea cave headland cliff and sea arch?

The order of these coastal features typically follows the process of erosion and formation. First, a headland is formed as waves erode softer rock, leaving harder rock protruding. Over time, sea caves develop through the erosion of these headlands. Continuous erosion can lead to the formation of sea arches, and eventually, as the arches collapse, sea stacks are left standing isolated offshore.