What is one critical element needed to best prepare new people for leadership positions?

a$.$ Have them shadow a successful leader to allow them to evolve their own working styles.

b$.$ Develop their leadership skills by giving them new opportunities to take on key assignments.

c$.$ Make sure that a new leader has the key traits that are prevalent in successful leaders.

d$.$ Ensure that a new leader has prior leadership and management experience, no matter how small it may be$.$