单选] Which of the following is the best definition of coaching and mentoring ?

A、Helpingapersonorteamcomeupwithnewideas
B、Helpingapersonorteamprioritizefeaturesinthebacklog
C、Providingguidanceanddirectiontoapersonorgroupinanefforttoimproveperformance
D、Helpingapersonorteamworktogethereffectively教练和指导的定义是
A、帮助个人或团队创造新想法
B、帮助个人或团队对待办事项进行优先级排序
C、指导个人或团队提高绩效
D、帮助个人或团队高效合作