Which of the following is true about management mentoring?

a$.$ Mentors and their prot$$g$$s break up soon after the prot$$g$$ reaches the cultivation stage of the mentoring relationship.

b$.$ Company mentoring programs that focus specifically on women and individuals of minority racial and ethnic backgrounds have been successful in some large firms.

c$.$ Mentors provide challenging work, coaching, visibility, protection, and sponsorship to their prot$$g$$s in the redefinition stage of the mentoring relationship.

d$.$ Female executives are reluctant to serve as mentors either to other women or to men because they themselves received little help.