What does it mean to use the least restrictive procedures?

Question $23$ options:

a$)$

Review and use only punishment procedures that do not involve physical contact with the individual.

b$)$

Review and use only reinforcement procedures when possible.

c$)$

Review and appraise the restrictiveness of procedures and always recommend whichever procedure is most effective.

d$)$

Review and appraise the restrictiveness of procedures and always recommend the least restrictive procedures likely to be effective.