Which of the following is proposed by the leader's mandate of the 21st century? A Leaders have to deliver results in the long-term while building change capacity for the short-term. B Leaders must follow Theory O to pursue short-term results. Leaders who are entrusted with authority within an organization must pursue results and build organizational capacity for change. D Leaders must create an official leadership mandate which is different from the unofficial one within a particular organization. E Leaders must follow Theory E to build long-term organizational capacity