Answer: II. anytime something changes
Your resume is a list of all your skills, accomplishments and work experience considered relevant for a work assignment. Before you start looking for work, you have to make sure that your resume is updated and includes all relevant information in a concise way. However, you should also update your resume whenever something changes, so that it is ready whenever necessary. This means that anytime you change jobs, learn a new skill, earn a diploma, etc. you need to write it down on your resume.