Which of the following is one of Frank Parson's guidelines for occupational decision-making? Group of answer choices a. Acquire knowledge about the world of work, including the requirements and conditions of success, compensation, and opportunities in a given field. b. Use "true reasoning" to relate self-knowledge to knowledge about the world of work, resulting in occupational choice. c. Develop a clear understanding of your aptitudes, interests, resources, limitations, and other qualities. d. All of the above