A key manager scheduled an extended absence from the office but did not inform his direct-reports. This caused a great deal of confusion in the department. How should you advise this manager to improve his communication? a.) Have the department secretary act as a gate-keeper to eliminate communications during his absence b.) Let people know about his absence in advance and who to contact while he's gone c.) Give his direct-reports time off from work so there is no need for communications during his absence d.) Avoid scheduling an extended absence again because of the potential confusion