The simplicity and complexity of mindfulness practice

In an attempt to elucidate both the simplicity and complexity of mindfulness practice, Shapiro and Carlson (in their book The Art and Science of Mindfulness) developed a model of mindfulness comprised of three core elements, which are: a. intention, attention and attitude b. happiness, attention and resilience c. flourishing, well-being, and positivity d. will-power, intention and prayer e. trance, wisdom and peacefulness