Which of the given statements define what is FITT? Select one: a. is a fine balance between providing just enough stress for the body to adapt and allowing enough time for healing and adaptation to occur b. the amount of effort that should be invested in a training program or any one session c. used to guide the development of unique and bespoke fitness plans that cater for an individual's specific needs d. the guidelines for training principles on how to achieve a particular goal such as physical, emotional and mental well being