Healthcare and public health professionals must ensure the highest level of care when treating patients. Which practice is a measure they take to ensure personal autonomy during public health interventions?

a. A study participant can end their participation in a clinical trial voluntarily at any time.
b. A private healthcare employer requires their employees to be vaccinated for COVID-19.
c. A drug abuse patient participates in a mandatory substance abuse and recovery program.
d. A high school basketball coach requires all players to have a medical physical before joining the team.